I found a solution! If you see this icon, go back to your headset press share then sync. Wait until it says video sent to app than return to your gallery. This has not failed to fix the issue so far.

This bug causes me endless suffering. I’m am trying to figure out if the video is just not actually synced all the way. Also when I download the file while it’s in this weird broken state, the file comes out as an mp4. What?