Hi @FIRE_TIKTOK, the error message Missing data for required field suggests Mindee is missing some data. On your screenshot, the query parameters field looks empty. I wonder if this might cause the trouble.
A while back I tested a request like this:
Any chance you can give the example workflow from the above post a go and confirm if Mindee accepts your request? You can of course replace the Read Binary Files node with any other node returning a binary item.