diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8247c2a1..1affa6aa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,7 @@ v1.4.1 [2020-02-14]
 -   [#3](https://github.com/latera/camunda-ext/pull/3) Add methods to tag entities into hid.Hydra class
 -   [#20](https://github.com/latera/camunda-ext/pull/20) Add newMessage method to MailSender class
 -   [#3200317](https://github.com/latera/camunda-ext/commit/3200317) Allow to pass constant id with non-Integer type into getConstantCode method
+-   [#24](https://github.com/latera/camunda-ext/pull/24) Add methods for files to document attaching
 
 ### Refactoring
 -   [#8](https://github.com/latera/camunda-ext/pull/8) Prettify runCommand,  Add constants, use constants instead of magic numbers in logger, Update docs
diff --git a/src/org/camunda/latera/bss/connectors/hoper/hydra/File.groovy b/src/org/camunda/latera/bss/connectors/hoper/hydra/File.groovy
index 2a909e18..e791b1fd 100644
--- a/src/org/camunda/latera/bss/connectors/hoper/hydra/File.groovy
+++ b/src/org/camunda/latera/bss/connectors/hoper/hydra/File.groovy
@@ -16,6 +16,10 @@ trait File {
     return getFileEntityType(getSubjectEntityType(subjectId), id)
   }
 
+  Map getContractFileEntityType(def contractId, def id = null) {
+    return getFileEntityType(getContractEntityType(contractId), id)
+  }
+
   private Map getFileDefaultParams() {
     return [
       name    : '',
@@ -53,6 +57,23 @@ trait File {
     return result
   }
 
+  List getContractFiles(Map input = [:], def contractId) {
+    LinkedHashMap params = getPaginationDefaultParams() + input
+
+    List result = []
+    List files  = getEntities(getContractFileEntityType(contractId), params)
+    if (files) {
+      files.each { it ->
+        result.add([
+          n_doc_file_id : it.n_doc_file_id,
+          file_name     : it.file_name,
+          content       : Base64Converter.from(it.base64_content)
+        ])
+      }
+    }
+    return result
+  }
+
   Map getSubjectFile(def subjectId, def fileId) {
     LinkedHashMap file = getEntity(getSubjectFileEntityType(subjectId), fileId)
     if (file) {
@@ -66,15 +87,37 @@ trait File {
     return file
   }
 
+  Map getContractFile(def contractId, def fileId) {
+    LinkedHashMap file = getEntity(getContractFileEntityType(contractId), fileId)
+    if (file) {
+      LinkedHashMap result = [
+        n_doc_file_id : file.n_doc_file_id,
+        file_name     : file.file_name,
+        content       : Base64Converter.from(file.base64_content)
+      ]
+      return result
+    }
+    return file
+  }
+
   Map getSubjectFile(Map input) {
     return getSubjectFile(input.subjectId, input.fileId)
   }
 
+  Map getContractFile(Map input) {
+    return getContractFile(input.contractId, input.fileId)
+  }
+
   Map createSubjectFile(Map input = [:], def subjectId) {
     LinkedHashMap params = getFileParams(input)
     return createEntity(getSubjectFileEntityType(subjectId), params)
   }
 
+  Map createContractFile(Map input = [:], def contractId) {
+    LinkedHashMap params = getFileParams(input)
+    return createEntity(getContractFileEntityType(contractId), params)
+  }
+
   List createSubjectFiles(Object[] input = [], def subjectId) {
     List result = []
     input.each { Map item ->
@@ -83,15 +126,32 @@ trait File {
     return result
   }
 
+  List createContractFiles(Object[] input = [], def contractId) {
+    List result = []
+    input.each { Map item ->
+      result += createContractFile(item, contractId)
+    }
+    return result
+  }
+
   List createSubjectFiles(def subjectId, List input) {
     return createSubjectFiles(input as Object[], subjectId)
   }
 
+  List createContractFiles(def contractId, List input) {
+    return createContractFiles(input as Object[], contractId)
+  }
+
   Map updateSubjectFile(Map input = [:], def subjectId, def fileId) {
     LinkedHashMap params = getFileParams(input)
     return updateEntity(getSubjectFileEntityType(subjectId), fileId, params)
   }
 
+  Map updateContractFile(Map input = [:], def contractId, def fileId) {
+    LinkedHashMap params = getFileParams(input)
+    return updateEntity(getContractFileEntityType(contractId), fileId, params)
+  }
+
   List updateSubjectFiles(Object[] input = [], def subjectId) {
     List result = []
     input.each { Map item ->
@@ -100,15 +160,35 @@ trait File {
     return result
   }
 
+  List updateContractFiles(Object[] input = [], def contractId) {
+    List result = []
+    input.each { Map item ->
+      result += updateContractFile(item + [contractId: contractId])
+    }
+    return result
+  }
+
   List updateSubjectFiles(def subjectId, List input) {
     return updateSubjectFiles(input as Object[], subjectId)
   }
 
+  List updateContractFiles(def contractId, List input) {
+    return updateContractFiles(input as Object[], subjectId)
+  }
+
   Boolean deleteSubjectFile(def subjectId, def fileId) {
     return deleteEntity(getSubjectFileEntityType(subjectId), fileId)
   }
 
+  Boolean deleteContractFile(def contractId, def fileId) {
+    return deleteEntity(getContractFileEntityType(contractId), fileId)
+  }
+
   Boolean deleteSubjectFile(Map input) {
     return deleteSubjectFile(input.subjectId, input.fileId)
   }
-}
\ No newline at end of file
+
+  Boolean deleteContractFile(Map input) {
+    return deleteContractFile(input.contractId, input.fileId)
+  }
+}