[Zubersoft]

I don't know what you mean when you say "Upload to companion", because the companion app is not designed for offline use. It connects to the device and just manages the library on the device. If you need to be able to configure things in an offline fashion, you need to purchase and install the full Windows version of MobileSheets through the Microsoft Store or my FastSpring store. Then you can backup your library on your tablet, restore that backup in the Windows version, and then manage your library using that. You'd then need to use the "Sync Library" feature to push changes back to your tablet.

Mike