[Zubersoft]

Oh I apologize - I missed that this is for the Windows version. That's going to be a problem, as the database file has to be stored in the application data directory which is different per user. So there is no way to have both accounts share the same file (but you can manually copy it between directories if needed). The database file (mobilesheets.db) can be found under this directory: C:\Users\<username>\AppData\Local\Packages\41730Zubersoft.MobileSheets_ys1c8ct2g6ypr\LocalState

If you change the storage location to a different folder that is the same for both accounts, then it's really just that one file that you need to sync between accounts.

Mike