Different sync tools manage files differently. And it likely depends on the file type.

I personally opted for a self hosted instance of Vaultwarden myself.

It should work for you! Especially if you are connected to the internet. But of course, wanted to bring up the one flaw I could think of up in case it would be an issue for you.

The downside is that if a device you aren’t online with modifies it, and doesn’t reconnect to the internet or even LAN that the other client is on, other clients will be out of date and potentially cause file syncing/overwriting issues.

But SyncThing is a good tool for this.