Missing mime type

app/controllers/dmsf_upload_controller.rb

@@ -102,6 +102,7 @@ class DmsfUploadController < ApplicationController
       uploaded_file[:tempfile_path] = upload.tempfile_path
       uploaded_file[:size] = upload.size
       uploaded_file[:digest] = upload.digest
+      uploaded_file[:mime_type] = upload.mime_type
     end
     commit_files_internal uploaded_files
   end

test/integration/rest_api/dmsf_file_api_test.rb

@@ -160,6 +160,7 @@ class DmsfFileApiTest < RedmineDmsf::Test::IntegrationTest
     assert_response :success
     revision = DmsfFileRevision.order(:created_at).last
     assert revision.present?
+    assert_equal 'text/plain', revision.mime_type
   end
 
   def test_upload_document_exceeded_attachment_max_size