diff --git a/proto/schema.proto b/proto/schema.proto
index ef498f8..bbf61c3 100644
--- a/proto/schema.proto
+++ b/proto/schema.proto
@@ -102,11 +102,12 @@ message ArrayArray {
 
 message JSONArray { repeated bytes data = 1; }
 
-message BlobFile {
-  string source_uri = 1;
+message BlobRefFile {
+  string bucket = 1;
+  string source_uri = 2;
 }
 
-message BlobArray {repeated BlobFile data = 1;}
+message BlobRefFileArray {repeated BlobRefFile data = 1;}
 
 message ValueField {
   oneof data {
@@ -131,7 +132,7 @@ message ScalarField {
     BytesArray bytes_data = 7;
     ArrayArray array_data = 8;
     JSONArray json_data = 9;
-    BlobArray blob_data = 10;
+    BlobRefFileArray blob_data = 10;
   }
 }