I see, thanks. Now I can sync the vault with a folder. I only need to figure out how dropbox handles this, it should sync the folder with the cloud version when anything changes.
/edit
too bad, not for the free version
Save folders for offline viewing on a mobile device is available to Dropbox Plus, Professional, Business, and Enterprise customers.
/edit 2
Single file will work in offline mode. Dont know if enpass uses a single file to store all its data, of so, it could work.