[Zubersoft]

If this is a new tablet running Android 6.0, it's possible you need to provide permissions for the application to access your storage. To do this, go to your tablet settings, then apps, then tap on MobileSheetsPro, then tap on permissions, and grant the storage permission (and contacts if you want to use Google Drive). This is something I'm going to be fixing in the next update so this permission is automatically requested.

If that isn't the issue, let me know.

Mike