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In videoconferencing mode, the presentation should only be added after the videoconference call has been established. The indicator that a call has been connected, is the appearance of the Far End room(s) on the projector screen to the right behind you.
Once the call has been connected add the presenter camera by touching the VC Presentation tab and Presenter Camera button.
There is no real purpose to show a view of the presenter on both projector screens though but someone might find this useful!