I installed the Webex app on my Android smartphone and tried using a USB camera, but I couldn’t successfully switch to the USB camera. Since the external camera switch works in the Zoom app, it seems unlikely to be a hardware issue.
I followed this article:
Use a USB camera with your Android device in Webex Meetings
Here are my specifications:
Hardware
Apps
Webex Meet: 45.3.0
Webex: 45.3.0.119