Open Settings
Tap Control Center
Tap the plus icon next to Screen Recording if it is not already included
Swipe down from the top-right corner of the screen on iPhone models with Face ID
Swipe up from the bottom of the screen on iPhone models with a Home button
Tap the Screen Recording button
Wait for the three-second countdown
To record with audio, press and hold the Screen Recording button, then tap Microphone On
To stop recording, tap the red status bar, red clock, or Screen Recording button in Control Center
Tap Stop when prompted
Find the recording in the Photos app