You can easily record a demonstration of something from your phone using the built-in  screen recorder. - Make sure your phone is updated to iOS 12 - Go to your Settings, then select Control Centre. Tap into ‘Customise Controls’ then add “Screen Recording” to the list - Exit your settings and then head to your homescreen. Swipe up the Control Centre and select the little white circle in the square icon. This is the Screen Recording icon. - The recorder will count down from 3 and then whatever actions you take on your iPhone will be recorded. - Once you’re done, tap the red recording timer at the top of your screen to stop the recording. You can find your recording in your camera roll and edit it just like a standard video such as trimming the start and end of it. Or, you can edit it in iMovie which comes free with your iPhone.