Photos Stopped Synching - What is the best way to troubleshoot

best way to troubleshoot is reading adb logcat while interacting and seeing what it stumbles into. As edrive syncs bidirectional (cloud deletions sync back, no file versioning), there’s danger of mishandling and a backup on a third device is sensible.

I saw 3 reports on this the last few months similar to yours

As of now, I don’t see something that reads exactly like this issue - Issues · e / Backlog · GitLab

while you could debug this, you can also disable the file sync and use nextcloud client to sync to murena, it has a larger user base and thus sees more scrutiny