Improve when wrapping an existing attachment

models/document_attachment.py

@@ -36,6 +36,10 @@
         - Associate the new attachment with the current object.
         """
 
+        # When wrapping an existing attachment, no need to pre-fill data.
+        if vals.get("file_id"):
+            return super(DocumentAttachment, self).create(vals)
+
         context = self._context
 
         if "res_model" not in context: