While apps like Explain Everything and Seesaw have built in screen recording options, there are also times when you'd like students to be able to record themselves talking over and app/explaining their thinking, but that app doesn't have this functionality. Well fret no more, you can ask students to activate screen recording, one time, for the rest of the year, and then they can screen record anything they can view on the iPad, it will automatically save to the camera roll where they can review/trim it.
So now apps like Padlet, Adobe Spark, even narrating websites, and Google Docs, can all be captured with a tap and hold.
Now you have enabled the iOS Screen Recorder.
Click here for an illustrated guide from osxdaily