Mobile App File Upload

Unable to upload certain files via mobile app. This is on an OMNIBUS self-hosted deployment.

Steps to reproduce
Select mp4 (not native video taken from camera) and try to upload. Get error, “JSON could not be serialized because of error:”

I’ve tried on iOS as well as Android. Android gives me a different generic error: “stream was reset NO ERROR”

Expected behavior
File upload properly like other files.

Observed behavior
Upload errors out and unable to proceed.