https://www.samsung.com/au/support/mobile-devices/using-screen-recorder/
1. Pull down the notification panel
2. Tap Screen Recorded
3. Choose the desired sound setting
4. Tap Start recording
Can tap the pause or stop icon at top right of screen when needing to pause or finish the screen record.
5. View recoded video by going to Gallery> Albums > Screen recordings
https://www.youtube.com/watch?v=DZKm_nqO7x4
1. Same as above but....
2. If you do not see screen recorder as an option in the notification panel, you will have to find the plus button to add it to the panel.