Unable to Render

I just got this app yesterday so I could send observation videos for my grad school program.

20 minutes, bare bones video. Single track. No transitions, no titles.

I checked my device (iPad) for space. 200 G available. Estimated file size: 785 MB

Another post mentioned locking the tracks. Done. Powered down and turned back on.

Tried all three available presets for quality setting.

I noticed an update to iOS 13.7, so I just ran that, rebooted. Tried again. Same message.

This is beyond frustrating. I've never had a video editing software that just refused to export, or required some kind of rain dance, if previous threads are any indication.

Of course this is happening on a tight deadline, lol.