#306

backend/app/services/material_sync_importer.rb

@@ -148,8 +148,7 @@ class MaterialSyncImporter
         io: tempfile,
         filename: @attributes[:filename],
         content_type: @attributes[:content_type])
-    blob.metadata['sha256'] = file_sha256 if file_sha256.present?
-    blob.save! if blob.changed?
+    MaterialFileSha256.assign_metadata_sha256!(blob, file_sha256)
     tempfile.rewind
     blob
   end
@@ -226,7 +225,7 @@ class MaterialSyncImporter
     if expected_sha256.present?
       return false unless material.file.attached?
 
-      return material.file.blob.metadata['sha256'] == expected_sha256
+      return MaterialFileSha256.metadata_sha256(material.file.blob) == expected_sha256
     end
 
     !material.file.attached?