Zoom App on Samsung Tablet

The Zoom app on my Galaxy Tab S4 works fine. But, I am using an external webcam (USB) via the USB-C port. The webcam works fine on its own but Zoom does not give me an option to use it. Thus, it defaults to the front-facing camera with no chance to have it use the attached webcam instead. Is it possible to have it use the external webcam since it is far better--and has a better mic--than the internal hardware?