Refresh the page
At the top of the browser, near the address bar, there should be a “refresh” symbol. Depending on your browser it may be in a different location, but it is generally in the top left corner. Click this, and your page will refresh.
Ensure external camera is plugged in
Look at the USB port and make sure the camera cable isn’t loose
If your camera is still not being detected switch USB ports
Check the correct video source is selected
Click the three vertical dots next to the Screen Share icon in Juno Live Session
Select your camera from the Choose Video Source drop down list