Yeah, just use the Beta, it’s extremely stable. Don’t get it from the Play Store though, as you’ve seen it hasn’t been updated in years. Just get it from their GitHub.
I’ve tried quite a few after leaving Nova a few years ago and have settled on Lawnchair. It seems to be the most stable and is under active development.
I use Syncthing for files/photos/videos and Nextcloud for calendar and contacts.