[Zubersoft]

This sounds like a permission issue to me. Go to your main tablet settings->Apps->MobileSheets->Permissions, and verify the Storage permission has been granted. Next, if your device is running Android 11 or higher, go to Settings->Apps, tap the three dots at the top right, then "Special Access", then "All files access" and make sure the all files access permission has been granted for MobileSheets. Then it should be able to access those files without any issues.

Mike