Apple includes a Screen Recording tool with its iOS 11 system to record the action on your iPhone screen, but you may need to enable it first. To do that, go to your iPhone’s home screen and open the Settings app.
On the Settings screen, tap Control Center and then on Customize Controls. Scroll down past the Include list to More Controls and tap the green plus (+) button next to Screen Recording. Once you have added Screen Recording to the list, a circular “record” button will appear on your Control Center screen when you swipe up from the bottom of the screen.
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