Keepass2Android implements syncing in a way that actually works. I sync through my nextcloud instance. On my laptop it’s just KeepassXC and the nextcloud desktop app, on my mobile (android) devices Keepass2Android. On iOS I think there was Strongbox but I haven’t used it in a long time. I tried using KeepassDX with the nextcloud android app for syncing for a while, but it lead to regular silent sync conflicts including password losses.
Keepass2Android handles that pretty well. It checks for external changes to the remote database before every local edit. And the desktop nextcloud app notices conflicts as well and can create a second version of the file if there are conflicts. You can then check for the differences with something like keepass-diff. But that should only happen if you change your db without syncing first, so while you are offline or the nextcloud app wasn’t running.