[Geoff Bacon]

As you have found, removing the MSP app also removes it's database and pdfs (although I thought it prompted to see if you wanted to keep these files)

One of the main things to remember is that MSP is designed to hold all the files on the tablet (this is for speed of retrieval and removes the need of internet when playing at gigs). This means that if you want the files elsewhere as well then you need to duplicate them there.
Personally, I use the Companion app on a Windows pc to make a backup of the Android tablet's database and pdfs onto the pc (sync wasn't  available when I started using the program)

I suggest you do what I did ie work through the manual and experiment with each of the topics it mentions. Note: you don't have to remember everything immediately, just concentrate on things you are likely to use.

Cheers
Geoff