Users with iPhone and iPad devices on iOS 11 or later can record their screen. This is useful when trying to capture an issue for your IT department to review. We'll walk you through how to enable the setting, record with and without sound, and how to view and share the video once it's completed.
Enable Screen Recording
To use the new screen recording feature in iOS 11, you'll first need to add the feature's button to Control Center.
Open Settings, swipe down to Control Center and scroll down to MORE CONTROLS. Then, you'll need to tap the green plus button next to Screen Recording.
Once its enabled, Swipe down from the top right corner of any screen to open Control Center and look for the 
Record button.
Record Without Sound
With the shortcut added to Control Center, swipe down from the Top Right corner of your iOS device's screen and tap the Screen Recording button. The button will begin counting down from 3, giving you time to get to the screen you want to record. The status bar at the top of your phone's display will turn red when it's actively recording. Tap the red bar to instantly stop recording.
Narrate as you Record
If you have a 3D Touch-enabled iOS device, hard-press on the Screen Recording shortcut in Control Center. If you lack 3D Touch, a long-press will work.
Press deeply on and tap Microphone to turn Microphone Audio on or off. Tap the button to turn audio recording on, then tap Start Recording. The microphone button will turn red when activated as a reminder that audio will be captured. You'll be recorded using your device's microphone along with whatever is on the screen.
View and Share
Once you stop recording, the video is saved to your phone's Camera Roll on your device. Open the Photos app to find it. You can then view, edit, and share the recording as you would a video you recorded using the Camera app.