Facebook is reportedly testing a new Messenger video option which would allow users to share their phone screen in a Messenger chat.
As you can see the image above this new option would switch to a screenshare of your mobile device, enabling you to share in-app experiences, videos, etc.
According to prolific reverse engineer Ms. Jane Manchun Wong, Facebook has recently begun work on bringing over Screen Sharing feature for its Messenger app users. The feature would be accessible as a button in the Audio/Video call screen. When the user turns on screen share, the camera is turned off and users in the chat will be able to see content that is being actively displayed on the user’s screen. On Android, Screen Share will work only if the user has granted Messenger permission to capture content displayed on the screen.