I’ve had similar on iOS - the app would crash after about 20 seconds, regardless of what I was doing with it.
For me, this started after I’d completely filled the memory on the phone with pictures; then had great difficulty even getting the app to start. (I’m now in the habit of taking a couple of dozen dummy pictures in the normal camera app, so if the phone does get filled up, I’ve got something to delete so I can make some space.)
After this, even after I’d emptied the phone out, restarted, etc etc, the app would often crash after about 20 seconds. Made uploading fun. Start app, upload 3 photos, crash, start app, upload 2 photos, crash.
Anyway, my guess is that something tries to download or update when the app starts up, because I’ve found that it doesn’t crash if wifi is off.
So for me, it doesn’t crash in the car (because there’s no wifi), and then to upload my workaround is turn wifi off, start the app, wait 30 seconds, turn wifi on, upload.