You can record your screen with audio (and a voiceover) on your iPhone to talk over your video. This functionality is built right into the iPhone. You don’t need to use a Mac or PC, or pay for an app ...

On iPhone and iPad, Apple's screen recording feature records a video of what you're doing on your screen, which is great if you want to capture gameplay, walk someone through a tutorial in an app, ...

You can record your iPhone's screen and edit the recording in the Photos app. You just need to enable Screen Recording in Settings.