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Keepass2Android supports Dropbox, Onedrive, and a few other ways of direct sync. https://play.google.com/store/apps/details?id=keepass2androi...

For Windows 10/11 users who use a MS account, put a portable copy of Keepass on OneDrive and it'll be there right after a fresh reinstall plus sign-in, and you can access it from the Android app using OneDrive sync built into K2A.

Keepass2Android also supports webdav, http, ftp, sftp and nextcloud directly

For Syncthing on iOS there is Möbius Sync. However, it struggles with background updates (due to iOS restrictions).

For iOS I can also recommend Strongbox.

Safe even on NFS? ;)