MediaWiki:Apierror-cannot-async-upload-file
From TIAO's Wiki
10 PCS, 10cm x 10cm, 2 layers prototype for $38.80 shipped!
The parameters async and file cannot be combined. If you want asynchronous processing of your uploaded file, first upload it to stash (using the stash parameter) and then publish the stashed file asynchronously (using filekey and async).
10 PCS, 10cm x 10cm, 2 layers prototype for $38.80 shipped!
