I'm using the Android app, and when I try to transcribe a phone call using a Bluetooth headset, nothing is recorded. The app says the audio is too short, because it fails to record anything. I've tried several different brands of headphones, with the same result.

When I try to transcribe a call directly through the phone, with no Bluetooth, it works fine.

I have noticed that all my Android using colleagues have this issue, and none of my iPhone using colleagues do. So presumably this is a bug in the Android app.