Reformat the SD as Portable/External as soon as you can and let us know how you get on.
RE Screen shots.
Once you have an app open and you want a screen shot use the ‘app button on the nav bar - the square one’.
Scroll to the app as if you were going to open or close it but do neither, you will see the option to take a screen shot of the app you scroll to. It does seem a little strange but works fine.