It's a function that allows you to capture what is displayed on your screen. It has a countdown feature and it also lets you capture screenshots while recording.
To start the screen recording, swipe down to access the Quick Settings menu and tap the Screen recorder icon to start the recording.
To make any changes to the screen recording, tap the v icon next to the timer and a tool bar will appear. Tap the Stop icon to stop recording, tap the screenshot icon to capture screenshot, and tap the Settings icon to change its settings.
You can also go to Settings > Advanced > Screen recorder to change its settings.
Note: This knowledge is currently only applicable for ZenFone6. Please stay tuned for further updates on our Official Website.