diff --git a/README.md b/README.md
index 781c7755..2ce94ba7 100644
--- a/README.md
+++ b/README.md
@@ -140,6 +140,12 @@ The base64 encoded content of the picked file if the option `readContent` was se
 
 If the user cancels the document picker without choosing a file (by pressing the system back button on Android or the Cancel button on iOS) the Promise will be rejected with a cancellation error. You can check for this error using `DocumentPicker.isCancel(err)` allowing you to ignore it and cleanup any parts of your interface that may not be needed anymore.
 
+#### `DocumentPicker.isInProgress(err)`
+
+If the user somehow manages to open multiple file pickers (eg. due the app being unresponsive), then only the picked result from the last opened picker will be considered and the promises form previous opened pickers will be rejected with an error that you can check using `DocumentPicker.isInProgress()`.
+
+This behavior might change in future to allow opening only a single picker at a time. The internal logic is currently implemented only on iOS.
+
 #### [iOS only] `DocumentPicker.releaseSecureAccess(uris: Array<string>)`
 
 If `mode` is set to `open` iOS is giving you a secure access to a file located outside from your sandbox.
diff --git a/android/src/main/java/com/reactnativedocumentpicker/DocumentPickerModule.java b/android/src/main/java/com/reactnativedocumentpicker/DocumentPickerModule.java
index 8fbf6a49..be8f4a5d 100644
--- a/android/src/main/java/com/reactnativedocumentpicker/DocumentPickerModule.java
+++ b/android/src/main/java/com/reactnativedocumentpicker/DocumentPickerModule.java
@@ -55,7 +55,7 @@ public class DocumentPickerModule extends ReactContextBaseJavaModule {
 
   private static final String OPTION_TYPE = "type";
   private static final String OPTION_MULTIPLE = "allowMultiSelection";
-  private static final String OPTION_COPYTO = "copyTo";
+  private static final String OPTION_COPY_TO = "copyTo";
 
   private static final String FIELD_URI = "uri";
   private static final String FIELD_FILE_COPY_URI = "fileCopyUri";
@@ -67,14 +67,15 @@ public class DocumentPickerModule extends ReactContextBaseJavaModule {
   private final ActivityEventListener activityEventListener = new BaseActivityEventListener() {
     @Override
     public void onActivityResult(Activity activity, int requestCode, int resultCode, Intent data) {
-      if (promise == null) {
+      final Promise storedPromise = promise;
+      if (storedPromise == null) {
         Log.e(NAME, "promise was null in onActivityResult");
         return;
       }
       if (requestCode == READ_REQUEST_CODE) {
-        onShowActivityResult(resultCode, data, promise);
+        onShowActivityResult(resultCode, data, storedPromise);
       } else if (requestCode == PICK_DIR_REQUEST_CODE) {
-        onPickDirectoryResult(resultCode, data, promise);
+        onPickDirectoryResult(resultCode, data);
       }
     }
   };
@@ -112,7 +113,7 @@ public String getName() {
   public void pick(ReadableMap args, Promise promise) {
     Activity currentActivity = getCurrentActivity();
     this.promise = promise;
-    this.copyTo = args.hasKey(OPTION_COPYTO) ? args.getString(OPTION_COPYTO) : null;
+    this.copyTo = args.hasKey(OPTION_COPY_TO) ? args.getString(OPTION_COPY_TO) : null;
 
     if (currentActivity == null) {
       sendError(E_ACTIVITY_DOES_NOT_EXIST, "Current activity does not exist");
@@ -165,7 +166,7 @@ public void pickDirectory(Promise promise) {
     }
   }
 
-  private void onPickDirectoryResult(int resultCode, Intent data, Promise promise) {
+  private void onPickDirectoryResult(int resultCode, Intent data) {
     if (resultCode == Activity.RESULT_CANCELED) {
       sendError(E_DOCUMENT_PICKER_CANCELED, "User canceled directory picker");
       return;
@@ -348,8 +349,8 @@ private void sendError(String code, String message) {
   }
 
   private void sendError(String code, String message, Exception e) {
-    if (this.promise != null) {
-      Promise temp = this.promise;
+    Promise temp = this.promise;
+    if (temp != null) {
       this.promise = null;
       temp.reject(code, message, e);
     }
diff --git a/example/ios/Podfile.lock b/example/ios/Podfile.lock
index 7897d87a..89550b39 100644
--- a/example/ios/Podfile.lock
+++ b/example/ios/Podfile.lock
@@ -1,274 +1,277 @@
 PODS:
   - boost-for-react-native (1.63.0)
   - DoubleConversion (1.1.6)
-  - FBLazyVector (0.64.2)
-  - FBReactNativeSpec (0.64.2):
-    - RCT-Folly (= 2020.01.13.00)
-    - RCTRequired (= 0.64.2)
-    - RCTTypeSafety (= 0.64.2)
-    - React-Core (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - ReactCommon/turbomodule/core (= 0.64.2)
+  - FBLazyVector (0.65.1)
+  - FBReactNativeSpec (0.65.1):
+    - RCT-Folly (= 2021.04.26.00)
+    - RCTRequired (= 0.65.1)
+    - RCTTypeSafety (= 0.65.1)
+    - React-Core (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - ReactCommon/turbomodule/core (= 0.65.1)
+  - fmt (6.2.1)
   - glog (0.3.5)
-  - RCT-Folly (2020.01.13.00):
+  - RCT-Folly (2021.04.26.00):
     - boost-for-react-native
     - DoubleConversion
+    - fmt (~> 6.2.1)
     - glog
-    - RCT-Folly/Default (= 2020.01.13.00)
-  - RCT-Folly/Default (2020.01.13.00):
+    - RCT-Folly/Default (= 2021.04.26.00)
+  - RCT-Folly/Default (2021.04.26.00):
     - boost-for-react-native
     - DoubleConversion
+    - fmt (~> 6.2.1)
     - glog
-  - RCTRequired (0.64.2)
-  - RCTTypeSafety (0.64.2):
-    - FBLazyVector (= 0.64.2)
-    - RCT-Folly (= 2020.01.13.00)
-    - RCTRequired (= 0.64.2)
-    - React-Core (= 0.64.2)
-  - React (0.64.2):
-    - React-Core (= 0.64.2)
-    - React-Core/DevSupport (= 0.64.2)
-    - React-Core/RCTWebSocket (= 0.64.2)
-    - React-RCTActionSheet (= 0.64.2)
-    - React-RCTAnimation (= 0.64.2)
-    - React-RCTBlob (= 0.64.2)
-    - React-RCTImage (= 0.64.2)
-    - React-RCTLinking (= 0.64.2)
-    - React-RCTNetwork (= 0.64.2)
-    - React-RCTSettings (= 0.64.2)
-    - React-RCTText (= 0.64.2)
-    - React-RCTVibration (= 0.64.2)
-  - React-callinvoker (0.64.2)
-  - React-Core (0.64.2):
+  - RCTRequired (0.65.1)
+  - RCTTypeSafety (0.65.1):
+    - FBLazyVector (= 0.65.1)
+    - RCT-Folly (= 2021.04.26.00)
+    - RCTRequired (= 0.65.1)
+    - React-Core (= 0.65.1)
+  - React (0.65.1):
+    - React-Core (= 0.65.1)
+    - React-Core/DevSupport (= 0.65.1)
+    - React-Core/RCTWebSocket (= 0.65.1)
+    - React-RCTActionSheet (= 0.65.1)
+    - React-RCTAnimation (= 0.65.1)
+    - React-RCTBlob (= 0.65.1)
+    - React-RCTImage (= 0.65.1)
+    - React-RCTLinking (= 0.65.1)
+    - React-RCTNetwork (= 0.65.1)
+    - React-RCTSettings (= 0.65.1)
+    - React-RCTText (= 0.65.1)
+    - React-RCTVibration (= 0.65.1)
+  - React-callinvoker (0.65.1)
+  - React-Core (0.65.1):
     - glog
-    - RCT-Folly (= 2020.01.13.00)
-    - React-Core/Default (= 0.64.2)
-    - React-cxxreact (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - React-jsiexecutor (= 0.64.2)
-    - React-perflogger (= 0.64.2)
+    - RCT-Folly (= 2021.04.26.00)
+    - React-Core/Default (= 0.65.1)
+    - React-cxxreact (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - React-jsiexecutor (= 0.65.1)
+    - React-perflogger (= 0.65.1)
     - Yoga
-  - React-Core/CoreModulesHeaders (0.64.2):
+  - React-Core/CoreModulesHeaders (0.65.1):
     - glog
-    - RCT-Folly (= 2020.01.13.00)
+    - RCT-Folly (= 2021.04.26.00)
     - React-Core/Default
-    - React-cxxreact (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - React-jsiexecutor (= 0.64.2)
-    - React-perflogger (= 0.64.2)
+    - React-cxxreact (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - React-jsiexecutor (= 0.65.1)
+    - React-perflogger (= 0.65.1)
     - Yoga
-  - React-Core/Default (0.64.2):
+  - React-Core/Default (0.65.1):
     - glog
-    - RCT-Folly (= 2020.01.13.00)
-    - React-cxxreact (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - React-jsiexecutor (= 0.64.2)
-    - React-perflogger (= 0.64.2)
+    - RCT-Folly (= 2021.04.26.00)
+    - React-cxxreact (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - React-jsiexecutor (= 0.65.1)
+    - React-perflogger (= 0.65.1)
     - Yoga
-  - React-Core/DevSupport (0.64.2):
+  - React-Core/DevSupport (0.65.1):
     - glog
-    - RCT-Folly (= 2020.01.13.00)
-    - React-Core/Default (= 0.64.2)
-    - React-Core/RCTWebSocket (= 0.64.2)
-    - React-cxxreact (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - React-jsiexecutor (= 0.64.2)
-    - React-jsinspector (= 0.64.2)
-    - React-perflogger (= 0.64.2)
+    - RCT-Folly (= 2021.04.26.00)
+    - React-Core/Default (= 0.65.1)
+    - React-Core/RCTWebSocket (= 0.65.1)
+    - React-cxxreact (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - React-jsiexecutor (= 0.65.1)
+    - React-jsinspector (= 0.65.1)
+    - React-perflogger (= 0.65.1)
     - Yoga
-  - React-Core/RCTActionSheetHeaders (0.64.2):
+  - React-Core/RCTActionSheetHeaders (0.65.1):
     - glog
-    - RCT-Folly (= 2020.01.13.00)
+    - RCT-Folly (= 2021.04.26.00)
     - React-Core/Default
-    - React-cxxreact (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - React-jsiexecutor (= 0.64.2)
-    - React-perflogger (= 0.64.2)
+    - React-cxxreact (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - React-jsiexecutor (= 0.65.1)
+    - React-perflogger (= 0.65.1)
     - Yoga
-  - React-Core/RCTAnimationHeaders (0.64.2):
+  - React-Core/RCTAnimationHeaders (0.65.1):
     - glog
-    - RCT-Folly (= 2020.01.13.00)
+    - RCT-Folly (= 2021.04.26.00)
     - React-Core/Default
-    - React-cxxreact (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - React-jsiexecutor (= 0.64.2)
-    - React-perflogger (= 0.64.2)
+    - React-cxxreact (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - React-jsiexecutor (= 0.65.1)
+    - React-perflogger (= 0.65.1)
     - Yoga
-  - React-Core/RCTBlobHeaders (0.64.2):
+  - React-Core/RCTBlobHeaders (0.65.1):
     - glog
-    - RCT-Folly (= 2020.01.13.00)
+    - RCT-Folly (= 2021.04.26.00)
     - React-Core/Default
-    - React-cxxreact (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - React-jsiexecutor (= 0.64.2)
-    - React-perflogger (= 0.64.2)
+    - React-cxxreact (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - React-jsiexecutor (= 0.65.1)
+    - React-perflogger (= 0.65.1)
     - Yoga
-  - React-Core/RCTImageHeaders (0.64.2):
+  - React-Core/RCTImageHeaders (0.65.1):
     - glog
-    - RCT-Folly (= 2020.01.13.00)
+    - RCT-Folly (= 2021.04.26.00)
     - React-Core/Default
-    - React-cxxreact (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - React-jsiexecutor (= 0.64.2)
-    - React-perflogger (= 0.64.2)
+    - React-cxxreact (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - React-jsiexecutor (= 0.65.1)
+    - React-perflogger (= 0.65.1)
     - Yoga
-  - React-Core/RCTLinkingHeaders (0.64.2):
+  - React-Core/RCTLinkingHeaders (0.65.1):
     - glog
-    - RCT-Folly (= 2020.01.13.00)
+    - RCT-Folly (= 2021.04.26.00)
     - React-Core/Default
-    - React-cxxreact (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - React-jsiexecutor (= 0.64.2)
-    - React-perflogger (= 0.64.2)
+    - React-cxxreact (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - React-jsiexecutor (= 0.65.1)
+    - React-perflogger (= 0.65.1)
     - Yoga
-  - React-Core/RCTNetworkHeaders (0.64.2):
+  - React-Core/RCTNetworkHeaders (0.65.1):
     - glog
-    - RCT-Folly (= 2020.01.13.00)
+    - RCT-Folly (= 2021.04.26.00)
     - React-Core/Default
-    - React-cxxreact (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - React-jsiexecutor (= 0.64.2)
-    - React-perflogger (= 0.64.2)
+    - React-cxxreact (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - React-jsiexecutor (= 0.65.1)
+    - React-perflogger (= 0.65.1)
     - Yoga
-  - React-Core/RCTSettingsHeaders (0.64.2):
+  - React-Core/RCTSettingsHeaders (0.65.1):
     - glog
-    - RCT-Folly (= 2020.01.13.00)
+    - RCT-Folly (= 2021.04.26.00)
     - React-Core/Default
-    - React-cxxreact (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - React-jsiexecutor (= 0.64.2)
-    - React-perflogger (= 0.64.2)
+    - React-cxxreact (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - React-jsiexecutor (= 0.65.1)
+    - React-perflogger (= 0.65.1)
     - Yoga
-  - React-Core/RCTTextHeaders (0.64.2):
+  - React-Core/RCTTextHeaders (0.65.1):
     - glog
-    - RCT-Folly (= 2020.01.13.00)
+    - RCT-Folly (= 2021.04.26.00)
     - React-Core/Default
-    - React-cxxreact (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - React-jsiexecutor (= 0.64.2)
-    - React-perflogger (= 0.64.2)
+    - React-cxxreact (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - React-jsiexecutor (= 0.65.1)
+    - React-perflogger (= 0.65.1)
     - Yoga
-  - React-Core/RCTVibrationHeaders (0.64.2):
+  - React-Core/RCTVibrationHeaders (0.65.1):
     - glog
-    - RCT-Folly (= 2020.01.13.00)
+    - RCT-Folly (= 2021.04.26.00)
     - React-Core/Default
-    - React-cxxreact (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - React-jsiexecutor (= 0.64.2)
-    - React-perflogger (= 0.64.2)
+    - React-cxxreact (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - React-jsiexecutor (= 0.65.1)
+    - React-perflogger (= 0.65.1)
     - Yoga
-  - React-Core/RCTWebSocket (0.64.2):
+  - React-Core/RCTWebSocket (0.65.1):
     - glog
-    - RCT-Folly (= 2020.01.13.00)
-    - React-Core/Default (= 0.64.2)
-    - React-cxxreact (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - React-jsiexecutor (= 0.64.2)
-    - React-perflogger (= 0.64.2)
+    - RCT-Folly (= 2021.04.26.00)
+    - React-Core/Default (= 0.65.1)
+    - React-cxxreact (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - React-jsiexecutor (= 0.65.1)
+    - React-perflogger (= 0.65.1)
     - Yoga
-  - React-CoreModules (0.64.2):
-    - FBReactNativeSpec (= 0.64.2)
-    - RCT-Folly (= 2020.01.13.00)
-    - RCTTypeSafety (= 0.64.2)
-    - React-Core/CoreModulesHeaders (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - React-RCTImage (= 0.64.2)
-    - ReactCommon/turbomodule/core (= 0.64.2)
-  - React-cxxreact (0.64.2):
+  - React-CoreModules (0.65.1):
+    - FBReactNativeSpec (= 0.65.1)
+    - RCT-Folly (= 2021.04.26.00)
+    - RCTTypeSafety (= 0.65.1)
+    - React-Core/CoreModulesHeaders (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - React-RCTImage (= 0.65.1)
+    - ReactCommon/turbomodule/core (= 0.65.1)
+  - React-cxxreact (0.65.1):
     - boost-for-react-native (= 1.63.0)
     - DoubleConversion
     - glog
-    - RCT-Folly (= 2020.01.13.00)
-    - React-callinvoker (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - React-jsinspector (= 0.64.2)
-    - React-perflogger (= 0.64.2)
-    - React-runtimeexecutor (= 0.64.2)
-  - React-jsi (0.64.2):
+    - RCT-Folly (= 2021.04.26.00)
+    - React-callinvoker (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - React-jsinspector (= 0.65.1)
+    - React-perflogger (= 0.65.1)
+    - React-runtimeexecutor (= 0.65.1)
+  - React-jsi (0.65.1):
     - boost-for-react-native (= 1.63.0)
     - DoubleConversion
     - glog
-    - RCT-Folly (= 2020.01.13.00)
-    - React-jsi/Default (= 0.64.2)
-  - React-jsi/Default (0.64.2):
+    - RCT-Folly (= 2021.04.26.00)
+    - React-jsi/Default (= 0.65.1)
+  - React-jsi/Default (0.65.1):
     - boost-for-react-native (= 1.63.0)
     - DoubleConversion
     - glog
-    - RCT-Folly (= 2020.01.13.00)
-  - React-jsiexecutor (0.64.2):
+    - RCT-Folly (= 2021.04.26.00)
+  - React-jsiexecutor (0.65.1):
     - DoubleConversion
     - glog
-    - RCT-Folly (= 2020.01.13.00)
-    - React-cxxreact (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - React-perflogger (= 0.64.2)
-  - React-jsinspector (0.64.2)
-  - react-native-document-picker (5.2.0):
+    - RCT-Folly (= 2021.04.26.00)
+    - React-cxxreact (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - React-perflogger (= 0.65.1)
+  - React-jsinspector (0.65.1)
+  - react-native-document-picker (6.0.5):
     - React-Core
-  - React-perflogger (0.64.2)
-  - React-RCTActionSheet (0.64.2):
-    - React-Core/RCTActionSheetHeaders (= 0.64.2)
-  - React-RCTAnimation (0.64.2):
-    - FBReactNativeSpec (= 0.64.2)
-    - RCT-Folly (= 2020.01.13.00)
-    - RCTTypeSafety (= 0.64.2)
-    - React-Core/RCTAnimationHeaders (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - ReactCommon/turbomodule/core (= 0.64.2)
-  - React-RCTBlob (0.64.2):
-    - FBReactNativeSpec (= 0.64.2)
-    - RCT-Folly (= 2020.01.13.00)
-    - React-Core/RCTBlobHeaders (= 0.64.2)
-    - React-Core/RCTWebSocket (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - React-RCTNetwork (= 0.64.2)
-    - ReactCommon/turbomodule/core (= 0.64.2)
-  - React-RCTImage (0.64.2):
-    - FBReactNativeSpec (= 0.64.2)
-    - RCT-Folly (= 2020.01.13.00)
-    - RCTTypeSafety (= 0.64.2)
-    - React-Core/RCTImageHeaders (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - React-RCTNetwork (= 0.64.2)
-    - ReactCommon/turbomodule/core (= 0.64.2)
-  - React-RCTLinking (0.64.2):
-    - FBReactNativeSpec (= 0.64.2)
-    - React-Core/RCTLinkingHeaders (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - ReactCommon/turbomodule/core (= 0.64.2)
-  - React-RCTNetwork (0.64.2):
-    - FBReactNativeSpec (= 0.64.2)
-    - RCT-Folly (= 2020.01.13.00)
-    - RCTTypeSafety (= 0.64.2)
-    - React-Core/RCTNetworkHeaders (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - ReactCommon/turbomodule/core (= 0.64.2)
-  - React-RCTSettings (0.64.2):
-    - FBReactNativeSpec (= 0.64.2)
-    - RCT-Folly (= 2020.01.13.00)
-    - RCTTypeSafety (= 0.64.2)
-    - React-Core/RCTSettingsHeaders (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - ReactCommon/turbomodule/core (= 0.64.2)
-  - React-RCTText (0.64.2):
-    - React-Core/RCTTextHeaders (= 0.64.2)
-  - React-RCTVibration (0.64.2):
-    - FBReactNativeSpec (= 0.64.2)
-    - RCT-Folly (= 2020.01.13.00)
-    - React-Core/RCTVibrationHeaders (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - ReactCommon/turbomodule/core (= 0.64.2)
-  - React-runtimeexecutor (0.64.2):
-    - React-jsi (= 0.64.2)
-  - ReactCommon/turbomodule/core (0.64.2):
+  - React-perflogger (0.65.1)
+  - React-RCTActionSheet (0.65.1):
+    - React-Core/RCTActionSheetHeaders (= 0.65.1)
+  - React-RCTAnimation (0.65.1):
+    - FBReactNativeSpec (= 0.65.1)
+    - RCT-Folly (= 2021.04.26.00)
+    - RCTTypeSafety (= 0.65.1)
+    - React-Core/RCTAnimationHeaders (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - ReactCommon/turbomodule/core (= 0.65.1)
+  - React-RCTBlob (0.65.1):
+    - FBReactNativeSpec (= 0.65.1)
+    - RCT-Folly (= 2021.04.26.00)
+    - React-Core/RCTBlobHeaders (= 0.65.1)
+    - React-Core/RCTWebSocket (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - React-RCTNetwork (= 0.65.1)
+    - ReactCommon/turbomodule/core (= 0.65.1)
+  - React-RCTImage (0.65.1):
+    - FBReactNativeSpec (= 0.65.1)
+    - RCT-Folly (= 2021.04.26.00)
+    - RCTTypeSafety (= 0.65.1)
+    - React-Core/RCTImageHeaders (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - React-RCTNetwork (= 0.65.1)
+    - ReactCommon/turbomodule/core (= 0.65.1)
+  - React-RCTLinking (0.65.1):
+    - FBReactNativeSpec (= 0.65.1)
+    - React-Core/RCTLinkingHeaders (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - ReactCommon/turbomodule/core (= 0.65.1)
+  - React-RCTNetwork (0.65.1):
+    - FBReactNativeSpec (= 0.65.1)
+    - RCT-Folly (= 2021.04.26.00)
+    - RCTTypeSafety (= 0.65.1)
+    - React-Core/RCTNetworkHeaders (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - ReactCommon/turbomodule/core (= 0.65.1)
+  - React-RCTSettings (0.65.1):
+    - FBReactNativeSpec (= 0.65.1)
+    - RCT-Folly (= 2021.04.26.00)
+    - RCTTypeSafety (= 0.65.1)
+    - React-Core/RCTSettingsHeaders (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - ReactCommon/turbomodule/core (= 0.65.1)
+  - React-RCTText (0.65.1):
+    - React-Core/RCTTextHeaders (= 0.65.1)
+  - React-RCTVibration (0.65.1):
+    - FBReactNativeSpec (= 0.65.1)
+    - RCT-Folly (= 2021.04.26.00)
+    - React-Core/RCTVibrationHeaders (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - ReactCommon/turbomodule/core (= 0.65.1)
+  - React-runtimeexecutor (0.65.1):
+    - React-jsi (= 0.65.1)
+  - ReactCommon/turbomodule/core (0.65.1):
     - DoubleConversion
     - glog
-    - RCT-Folly (= 2020.01.13.00)
-    - React-callinvoker (= 0.64.2)
-    - React-Core (= 0.64.2)
-    - React-cxxreact (= 0.64.2)
-    - React-jsi (= 0.64.2)
-    - React-perflogger (= 0.64.2)
+    - RCT-Folly (= 2021.04.26.00)
+    - React-callinvoker (= 0.65.1)
+    - React-Core (= 0.65.1)
+    - React-cxxreact (= 0.65.1)
+    - React-jsi (= 0.65.1)
+    - React-perflogger (= 0.65.1)
   - Yoga (1.14.0)
 
 DEPENDENCIES:
@@ -307,6 +310,7 @@ DEPENDENCIES:
 SPEC REPOS:
   trunk:
     - boost-for-react-native
+    - fmt
 
 EXTERNAL SOURCES:
   DoubleConversion:
@@ -370,36 +374,37 @@ EXTERNAL SOURCES:
 
 SPEC CHECKSUMS:
   boost-for-react-native: 39c7adb57c4e60d6c5479dd8623128eb5b3f0f2c
-  DoubleConversion: cf9b38bf0b2d048436d9a82ad2abe1404f11e7de
-  FBLazyVector: e686045572151edef46010a6f819ade377dfeb4b
-  FBReactNativeSpec: 3a5b38d2aa0c1f7c7598af7b503bc10959ab1e0e
-  glog: 73c2498ac6884b13ede40eda8228cb1eee9d9d62
-  RCT-Folly: ec7a233ccc97cc556cf7237f0db1ff65b986f27c
-  RCTRequired: 6d3e854f0e7260a648badd0d44fc364bc9da9728
-  RCTTypeSafety: c1f31d19349c6b53085766359caac425926fafaa
-  React: bda6b6d7ae912de97d7a61aa5c160db24aa2ad69
-  React-callinvoker: 9840ea7e8e88ed73d438edb725574820b29b5baa
-  React-Core: b5e385da7ce5f16a220fc60fd0749eae2c6120f0
-  React-CoreModules: 17071a4e2c5239b01585f4aa8070141168ab298f
-  React-cxxreact: 9be7b6340ed9f7c53e53deca7779f07cd66525ba
-  React-jsi: 67747b9722f6dab2ffe15b011bcf6b3f2c3f1427
-  React-jsiexecutor: 80c46bd381fd06e418e0d4f53672dc1d1945c4c3
-  React-jsinspector: cc614ec18a9ca96fd275100c16d74d62ee11f0ae
-  react-native-document-picker: b955bfbde32d6da61e4e5b486d1acb5b3485a192
-  React-perflogger: 25373e382fed75ce768a443822f07098a15ab737
-  React-RCTActionSheet: af7796ba49ffe4ca92e7277a5d992d37203f7da5
-  React-RCTAnimation: 6a2e76ab50c6f25b428d81b76a5a45351c4d77aa
-  React-RCTBlob: 02a2887023e0eed99391b6445b2e23a2a6f9226d
-  React-RCTImage: ce5bf8e7438f2286d9b646a05d6ab11f38b0323d
-  React-RCTLinking: ccd20742de14e020cb5f99d5c7e0bf0383aefbd9
-  React-RCTNetwork: dfb9d089ab0753e5e5f55fc4b1210858f7245647
-  React-RCTSettings: b14aef2d83699e48b410fb7c3ba5b66cd3291ae2
-  React-RCTText: 41a2e952dd9adc5caf6fb68ed46b275194d5da5f
-  React-RCTVibration: 24600e3b1aaa77126989bc58b6747509a1ba14f3
-  React-runtimeexecutor: a9904c6d0218fb9f8b19d6dd88607225927668f9
-  ReactCommon: 149906e01aa51142707a10665185db879898e966
-  Yoga: 575c581c63e0d35c9a83f4b46d01d63abc1100ac
+  DoubleConversion: 831926d9b8bf8166fd87886c4abab286c2422662
+  FBLazyVector: 33c82491102f20ecddb6c6a2c273696ace3191e0
+  FBReactNativeSpec: df8f81d2a7541ee6755a047b398a5cb5a72acd0e
+  fmt: ff9d55029c625d3757ed641535fd4a75fedc7ce9
+  glog: 5337263514dd6f09803962437687240c5dc39aa4
+  RCT-Folly: 0dd9e1eb86348ecab5ba76f910b56f4b5fef3c46
+  RCTRequired: 6cf071ab2adfd769014b3d94373744ee6e789530
+  RCTTypeSafety: b829c59453478bb5b02487b8de3336386ab93ab1
+  React: 29d8a785041b96a2754c25cc16ddea57b7a618ce
+  React-callinvoker: 2857b61132bd7878b736e282581f4b42fd93002b
+  React-Core: 001e21bad5ca41e59e9d90df5c0b53da04c3ce8e
+  React-CoreModules: 0a0410ab296a62ab38e2f8d321e822d1fcc2fe49
+  React-cxxreact: 8d904967134ae8ff0119c5357c42eaae976806f8
+  React-jsi: 12913c841713a15f64eabf5c9ad98592c0ec5940
+  React-jsiexecutor: 43f2542aed3c26e42175b339f8d37fe3dd683765
+  React-jsinspector: 41e58e5b8e3e0bf061fdf725b03f2144014a8fb0
+  react-native-document-picker: 73ae67717ba14756a5dd291116fb7d35506b1200
+  React-perflogger: fd28ee1f2b5b150b00043f0301d96bd417fdc339
+  React-RCTActionSheet: 7f3fa0855c346aa5d7c60f9ced16e067db6d29fa
+  React-RCTAnimation: 2119a18ee26159004b001bc56404ca5dbaae6077
+  React-RCTBlob: a493cc306deeaba0c0efa8ecec2da154afd3a798
+  React-RCTImage: 54999ddc896b7db6650af5760607aaebdf30425c
+  React-RCTLinking: 7fb3fa6397d3700c69c3d361870a299f04f1a2e6
+  React-RCTNetwork: 329ee4f75bd2deb8cf6c4b14231b5bb272cbd9af
+  React-RCTSettings: 1a659d58e45719bc77c280dbebce6a5a5a2733f5
+  React-RCTText: e12d7aae2a038be9ae72815436677a7c6549dd26
+  React-RCTVibration: 92d41c2442e5328cc4d342cd7f78e5876b68bae5
+  React-runtimeexecutor: 85187f19dd9c47a7c102f9994f9d14e4dc2110de
+  ReactCommon: eafed38eec7b591c31751bfa7494801618460459
+  Yoga: aa0cb45287ebe1004c02a13f279c55a95f1572f4
 
 PODFILE CHECKSUM: bf9d3f3f6474ffdee02b3d7ef2c181d09c3d1203
 
-COCOAPODS: 1.10.1
+COCOAPODS: 1.10.2
diff --git a/example/src/App.tsx b/example/src/App.tsx
index 098bd52a..0ea71545 100644
--- a/example/src/App.tsx
+++ b/example/src/App.tsx
@@ -4,6 +4,7 @@ import { StyleSheet, View, Text, Button } from 'react-native'
 import DocumentPicker, {
   DirectoryPickerResponse,
   DocumentPickerResponse,
+  isInProgress,
   types,
 } from 'react-native-document-picker'
 
@@ -16,6 +17,8 @@ export default function App() {
     if (DocumentPicker.isCancel(err)) {
       console.warn('cancelled')
       // User cancelled the picker, exit any dialogs or menus and move on
+    } else if (isInProgress(err)) {
+      console.warn('multiple pickers were opened, only the last will be considered')
     } else {
       throw err
     }
@@ -58,6 +61,16 @@ export default function App() {
             .catch(handleError)
         }}
       />
+      <Button
+        title="releaseSecureAccess"
+        onPress={() => {
+          DocumentPicker.releaseSecureAccess([])
+            .then(() => {
+              console.warn('releaseSecureAccess: success')
+            })
+            .catch(handleError)
+        }}
+      />
       <Button
         title="open directory picker (android+windows only)"
         onPress={() => {
@@ -65,7 +78,7 @@ export default function App() {
         }}
       />
 
-      <Text>Result: {JSON.stringify(result, null, 2)}</Text>
+      <Text selectable>Result: {JSON.stringify(result, null, 2)}</Text>
     </View>
   )
 }
diff --git a/ios/RNCPromiseWrapper.h b/ios/RNCPromiseWrapper.h
new file mode 100644
index 00000000..b7fd1216
--- /dev/null
+++ b/ios/RNCPromiseWrapper.h
@@ -0,0 +1,27 @@
+//
+//  RNCPromiseWrapper.h
+//  react-native-document-picker
+//
+//  Created by Vojtech Novak on 02/10/2021.
+//
+
+#import <Foundation/Foundation.h>
+#import <React/RCTBridgeModule.h>
+
+static NSString * _Nonnull const ASYNC_OP_IN_PROGRESS = @"ASYNC_OP_IN_PROGRESS";
+
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface RNCPromiseWrapper : NSObject
+
+-(void)setPromiseWithInProgressCheck:(RCTPromiseResolveBlock)resolve rejecter:(RCTPromiseRejectBlock)reject fromCallSite: (NSString*) callsite;
+-(void)resolve: (id) result;
+-(void)reject:(NSString *)message withError:(NSError *)error;
+-(void)reject:(NSString *)message withCode:(NSString*) code withError:(NSError *)error;
+
+@property (readonly, assign) NSString *nameOfCallInProgress;
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/ios/RNCPromiseWrapper.m b/ios/RNCPromiseWrapper.m
new file mode 100644
index 00000000..6a7b6066
--- /dev/null
+++ b/ios/RNCPromiseWrapper.m
@@ -0,0 +1,71 @@
+//
+//  RNCPromiseWrapper.m
+//  react-native-document-picker
+//
+//  Created by Vojtech Novak on 02/10/2021.
+//
+
+
+#import <Foundation/Foundation.h>
+#import "RNCPromiseWrapper.h"
+
+
+@interface RNCPromiseWrapper ()
+
+@property (nonatomic, strong) RCTPromiseResolveBlock promiseResolve;
+@property (nonatomic, strong) RCTPromiseRejectBlock promiseReject;
+@property (readwrite, assign) NSString *nameOfCallInProgress;
+
+@end
+
+@implementation RNCPromiseWrapper
+
+-(void)setPromiseWithInProgressCheck: (RCTPromiseResolveBlock)resolve rejecter:(RCTPromiseRejectBlock)reject fromCallSite:(NSString *) callsite {
+  if (self.promiseReject) {
+    [self rejectPreviousPromiseBecauseNewOneIsInProgress:self.promiseReject requestedOperation:callsite];
+  }
+  self.promiseResolve = resolve;
+  self.promiseReject = reject;
+  self.nameOfCallInProgress = callsite;
+}
+
+-(void)resolve: (id) result {
+  RCTPromiseResolveBlock resolver = self.promiseResolve;
+  if (resolver == nil) {
+    NSLog(@"cannot resolve promise because it's null");
+    return;
+  }
+  [self resetMembers];
+  resolver(result);
+}
+
+-(void)reject:(NSString *)message withError:(NSError *)error {
+    NSString* errorCode = [NSString stringWithFormat:@"%ld", error.code];
+    [self reject:message withCode:errorCode withError:error];
+}
+
+-(void)reject:(NSString *)message withCode:(NSString*) errorCode withError:(NSError *)error {
+    RCTPromiseRejectBlock rejecter = self.promiseReject;
+    if (rejecter == nil) {
+      NSLog(@"cannot reject promise because it's null");
+      return;
+    }
+    NSString* errorMessage = [NSString stringWithFormat:@"RNCPromiseWrapper: %@, %@", message, error.description];
+
+    [self resetMembers];
+    rejecter(errorCode, errorMessage, error);
+}
+
+-(void)resetMembers {
+  self.promiseResolve = nil;
+  self.promiseReject = nil;
+  self.nameOfCallInProgress = nil;
+}
+
+- (void)rejectPreviousPromiseBecauseNewOneIsInProgress: (RCTPromiseRejectBlock)reject requestedOperation:(NSString *) callSiteName {
+  NSString *msg = [NSString stringWithFormat:@"Warning: previous promise did not settle and was overwritten. You've called \"%@\" while \"%@\" was already in progress and has not completed yet.", callSiteName, self.nameOfCallInProgress];
+  reject(ASYNC_OP_IN_PROGRESS, msg, nil);
+}
+
+
+@end
diff --git a/ios/RNDocumentPicker.m b/ios/RNDocumentPicker.m
index 47876354..8737f9d0 100644
--- a/ios/RNDocumentPicker.m
+++ b/ios/RNDocumentPicker.m
@@ -5,7 +5,7 @@
 #import <React/RCTConvert.h>
 #import <React/RCTBridge.h>
 #import <React/RCTUtils.h>
-
+#import "RNCPromiseWrapper.h"
 
 static NSString *const E_DOCUMENT_PICKER_CANCELED = @"DOCUMENT_PICKER_CANCELED";
 static NSString *const E_INVALID_DATA_RETURNED = @"INVALID_DATA_RETURNED";
@@ -26,8 +26,7 @@ @interface RNDocumentPicker () <UIDocumentPickerDelegate, UIAdaptivePresentation
 @implementation RNDocumentPicker {
     UIDocumentPickerMode mode;
     NSString *copyDestination;
-    NSMutableArray *composeResolvers;
-    NSMutableArray *composeRejecters;
+    RNCPromiseWrapper* promiseWrapper;
     NSMutableArray *urls;
 }
 
@@ -36,8 +35,7 @@ @implementation RNDocumentPicker {
 - (instancetype)init
 {
     if ((self = [super init])) {
-        composeResolvers = [NSMutableArray new];
-        composeRejecters = [NSMutableArray new];
+        promiseWrapper = [RNCPromiseWrapper new];
         urls = [NSMutableArray new];
     }
     return self;
@@ -68,14 +66,14 @@ - (dispatch_queue_t)methodQueue
 {
     mode = options[@"mode"] && [options[@"mode"] isEqualToString:@"open"] ? UIDocumentPickerModeOpen : UIDocumentPickerModeImport;
     copyDestination = options[@"copyTo"] ? options[@"copyTo"] : nil;
-    [composeResolvers addObject:resolve];
-    [composeRejecters addObject:reject];
+    [promiseWrapper setPromiseWithInProgressCheck:resolve rejecter:reject fromCallSite:@"pick"];
 
     NSArray *allowedUTIs = [RCTConvert NSArray:options[OPTION_TYPE]];
     UIDocumentPickerViewController *documentPicker = [[UIDocumentPickerViewController alloc] initWithDocumentTypes:(NSArray *)allowedUTIs inMode:mode];
+    documentPicker.modalPresentationStyle = UIModalPresentationFormSheet;
+
     documentPicker.delegate = self;
     documentPicker.presentationController.delegate = self;
-    documentPicker.modalPresentationStyle = UIModalPresentationFormSheet;
 
     if (@available(iOS 11.0, *)) {
         documentPicker.allowsMultipleSelection = [RCTConvert BOOL:options[OPTION_MULTIPLE]];
@@ -143,7 +141,9 @@ - (NSMutableDictionary *)getMetadataForUrl:(NSURL *)url error:(NSError **)error
     }
 }
 
-RCT_EXPORT_METHOD(releaseSecureAccess:(NSArray<NSString *> *)uris)
+RCT_EXPORT_METHOD(releaseSecureAccess:(NSArray<NSString *> *)uris
+                  resolver:(RCTPromiseResolveBlock)resolve
+                  rejecter:(RCTPromiseRejectBlock)reject)
 {
     NSMutableArray *discardedItems = [NSMutableArray array];
     for (NSString *uri in uris) {
@@ -156,6 +156,7 @@ - (NSMutableDictionary *)getMetadataForUrl:(NSURL *)url error:(NSError **)error
         }
     }
     [urls removeObjectsInArray:discardedItems];
+    resolve(nil);
 }
 
 + (NSURL *)getDirectoryForFileCopy:(NSString *)copyToDirectory
@@ -189,35 +190,8 @@ + (NSURL *)copyToUniqueDestinationFrom:(NSURL *)url usingDestinationPreset:(NSSt
     }
 }
 
-- (void)documentPicker:(UIDocumentPickerViewController *)controller didPickDocumentAtURL:(NSURL *)url
-{
-    RCTPromiseResolveBlock resolve = [composeResolvers lastObject];
-    RCTPromiseRejectBlock reject = [composeRejecters lastObject];
-    [composeResolvers removeLastObject];
-    [composeRejecters removeLastObject];
-
-    NSError *error;
-    NSMutableDictionary *result = [self getMetadataForUrl:url error:&error];
-    if (result) {
-        NSArray *results = @[result];
-        resolve(results);
-    } else {
-        reject(E_INVALID_DATA_RETURNED, error.localizedDescription, error);
-    }
-}
-
 - (void)documentPicker:(UIDocumentPickerViewController *)controller didPickDocumentsAtURLs:(NSArray<NSURL *> *)urls
 {
-    RCTPromiseResolveBlock resolve = [composeResolvers lastObject];
-
-    if (resolve == nil) {
-        return;
-    }
-
-    RCTPromiseRejectBlock reject = [composeRejecters lastObject];
-    [composeResolvers removeLastObject];
-    [composeRejecters removeLastObject];
-
     NSMutableArray *results = [NSMutableArray array];
     for (id url in urls) {
         NSError *error;
@@ -225,30 +199,28 @@ - (void)documentPicker:(UIDocumentPickerViewController *)controller didPickDocum
         if (result) {
             [results addObject:result];
         } else {
-            reject(E_INVALID_DATA_RETURNED, error.localizedDescription, error);
+            [promiseWrapper reject:E_INVALID_DATA_RETURNED withError:error];
             return;
         }
     }
 
-    resolve(results);
+    [promiseWrapper resolve:results];
 }
 
 - (void)documentPickerWasCancelled:(UIDocumentPickerViewController *)controller
 {
-    [self rejectLastSelection];
+    [self rejectAsUserCancellationError];
 }
 
 - (void)presentationControllerDidDismiss:(UIPresentationController *)presentationController {
-    [self rejectLastSelection];
+    [self rejectAsUserCancellationError];
 }
 
-- (void)rejectLastSelection
+- (void)rejectAsUserCancellationError
 {
-    RCTPromiseRejectBlock reject = [composeRejecters lastObject];
-    [composeResolvers removeLastObject];
-    [composeRejecters removeLastObject];
-
-    reject(E_DOCUMENT_PICKER_CANCELED, @"User canceled document picker", nil);
+    // TODO make error nullable?
+    NSError* error = [NSError errorWithDomain:NSCocoaErrorDomain code:NSUserCancelledError userInfo:nil];
+    [promiseWrapper reject:@"user canceled the document picker" withCode:E_DOCUMENT_PICKER_CANCELED withError:error];
 }
 
 @end
diff --git a/src/index.tsx b/src/index.tsx
index e945c3b1..004c44e8 100644
--- a/src/index.tsx
+++ b/src/index.tsx
@@ -142,10 +142,14 @@ export function releaseSecureAccess(uris: Array<string>): Promise<void> {
 }
 
 const E_DOCUMENT_PICKER_CANCELED = 'DOCUMENT_PICKER_CANCELED'
+const E_DOCUMENT_PICKER_IN_PROGRESS = 'ASYNC_OP_IN_PROGRESS'
 
 export function isCancel(err: Error & { code?: string }): boolean {
   return err?.code === E_DOCUMENT_PICKER_CANCELED
 }
+export function isInProgress(err: Error & { code?: string }): boolean {
+  return err?.code === E_DOCUMENT_PICKER_IN_PROGRESS
+}
 
 export default {
   isCancel,