Screenshot not working since update
My iPhone 7 plus will not take screenshots since I did the update! I would hit the on/off button and the home button at the same time. Now I get nothing!
Have you already tried a forced restart of your iP7+?
Press and hold both the Side (power) and Volume Down buttons for at least 10 seconds, until you see the Apple logo. When it appears, release both buttons and wait for your iphone to restart, then test it.
Regards
Giulio