Would be great to choose a location as a sync destination. For example to sync multiple vaults in a single dropbox. I imagine saving a private.enpassdbsync and a business.enpassdbsync in the same dropbox but different folders. This way I could create a shared vault for our company in our dropbox folder and keep my personal data in a separate folder. Also you could also sync with other services not supported by enpass.

Completely agree with this - and should be for any target cloud, so for OneDrive, DropBox, etc.

I think it would be best to just select a file destination. Then you are not dependend on support for a specific cloud. And could store you wallet sync file wherever you want.

File destination is definitely best in my opinion, since this would also support non cloud based syncing solutions like Resilio Sync or Syncthing