Camera doesn't pop up after being pushed down during a video call

Problem:

If the user pushes down the camera during a video call, the app used for the call will be sent to the background and display its Dropzone, and the camera may not be able to pop up again.

Cause:

The chat app is unable to detect the camera being pushed down by the user and the camera may subsequently be unable to pop up again.

Solution:

1. After the app is switched from the Dropzone to full-screen display, switch to the rear camera and then switch back to the front camera.
2. It is recommended that you do not manually push down the camera during a video call or when you are taking a photo.