https://techcrunch.com/2017/11/09/essential-phone-can-now-stream-live-to-facebook-from-the-360-camera-add-on/

The Essential Phone just got a camera software update that will allow owners of the device to broadcast live, 360-degree video right from the native camera app, provided they have the Essential 360 Camera, too. The update requires no extra software, and live streaming becomes available soon as you snap the 360 camera onto the magnetic accessory port on the back of the Essential Phone.

Snapping on the camera will boot up the camera app as before, in 360 mode, and then you can either tap the 360-degree Live option, or just swipe left to switch to that mode. On first use, you’ll have to tap that red “Live” camera button to login to your Facebook account, and then enable permissions for posting to your account.