I use NextCloud myself to share the actual DB, and the keepass2android[0] app. It works great although the app looks for app names instead of URLs sometimes so

I use NextCloud myself to share the actual DB, and the keepass2android[0] app. It works great although the app looks for app names instead of URLs sometimes so you'll have to hit the search button. Takes two seconds longer but it's no sweat. You can use any file sharing service you want.