Both methods work.It's power button hold, then tap the fingerprint scanner at the same time.
It's power button hold, then tap the fingerprint scanner at the same time.
You could also try Google Now On Tap. First, turn it on by opening Google Now, swiping in from the left, tapping Settings>Now On Tap and switching it on. Then, when you're on the screen you want to capture, long-press the Home button to bring up Google Now On Tap, and there should be a Share Screen option. That will take a screenshot.