How to record a screen on an iPhone
You can record actions on the iPhone screen.
Go to Settings > Control Center, then tap the Insert Record button next to Record Screen.
Open the control center, tap the "Record Screen" button, and wait for a 3-second countdown.
To stop recording, open the Control Center, tap the selected "Record Screen" button or the red status bar at the top of the screen, and tap "Stop."
The recording is automatically saved to the photo gallery in the Photos App. To see all your recordings in one place, open Photos, tap Albums, and then tap Recordings under Media Type.