Run into a bug lately where you're unable to take screenshots on android after the latest upgrade? This happened to me on my pixel phone recently, and it's rather unfortunate & frustrating. The good news is it's quite simple to correct.
The method I've chosen to correct this was to reenable 3 button navigation which takes all of ~30 seconds:
SystemGestures > System navigation3-button navigation.All set! Now the square icon in the lower right will offer Screenshot as an option.