[JimR]

I'm trying to connect 2 windows computers via the companion app.  Is that possible?  Is there a comprehensive manual, tutorial or anything that will get me off the ground using this app?  I find nothing intuitive about it.  
Why extract files from a backup? Why not reference the actual library?
How it initiate connection between to Windows computers?  Is it even possible?
There are a topn of other questions.  Help someone, anyone, please.

[Zubersoft]

It depends what you are trying to achieve. You can certainly run MobileSheets on one device and connect that to the companion app on the other device. You can then drag & drop PDFs into the companion app to create your songs. There are a series of tutorial videos here: https://www.zubersoft.com/mobilesheets/tutorials

There is a video here on importing files: https://www.youtube.com/watch?v=_mWkW0jidFA

You don't need to use the companion app for anything - just tap Import->Local File and select PDFs on the device, or tap Import->Dropbox to import files directly off Dropbox. Once you've created songs, you can click them to view the PDFs that are associated with the songs.

Mike