It’s easier than ever to start recording your iPhone and other iOS device screens and turn them into a movie. It’s just a matter of mirroring your device onto your laptop with any number of apps then firing up a tool like Camtasia to record what’s happening on your screen. But there are still a few quirky things you may encounter along the way. These tips will help you get great results the first time you dive into iOS screencasting.
https://blogs.techsmith.com/tips-how-tos/13-tips-for-recording-iphone-ipad-ipod/