trying to write to dataset

app.py

@@ -43,7 +43,7 @@ def submit_boundary(
         json.dump(record, tmp, indent=2)
         tmp.flush()
         upload_file(
-            path_or_fileobj=tmp.name,  # this is just a string path
+            path_or_fileobj=f_in, 
             path_in_repo=filename,
             repo_id=repo_id,
             repo_type="dataset",