Thank you for using the AMP Engine label. I will run this by our Developers, this is a new one. I'm not at all familiar with Avro files, are you able to try it with another file type to see if it is not specific to Avro - it may just be related to the REST API extract. I'd like to narrow it down a bit if possible. If our Developers cannot determine anything from this information, I will get back to you and ask you to go through Support so that they can help troubleshoot and then escalate it to us with a workflow to reliably reproduce the issue.
Sr. Technical Product Manager, Alteryx Engines