Removed the record->write calls

write happens in the list->add method

bulkUpload/code/GridFieldBulkUpload_Request.php

@@ -107,7 +107,6 @@ class GridFieldBulkUpload_Request extends RequestHandler
 
         // Attach the file to record.
         $record->{"{$fileRelationName}ID"} = $uploadResponse['id'];
-        $record->write();
 
         // attached record to gridField relation
         $this->gridField->list->add($record);
@@ -221,7 +220,6 @@ class GridFieldBulkUpload_Request extends RequestHandler
 
             // attach file
             $record->{"{$fileRelationName}ID"} = $attachResponse['id'];
-            $record->write();
 
             // attached record to gridField relation
             $this->gridField->list->add($record);