Bingowings said:

Maybe those Bothan spies have hidden cameras on the Death Star and transmit the details of the Emperor's visit to a base or ship in the form of holograms.

Things like the Star Tours footage could be holograms projected from the briefing room table during the battle.

i have a sequence partly inspired by your idea of a transmission Bingowings... And I have to do some work on it before putting it up here as a concept... It is a bit lacking in terms of there being more human elements in the sequence... But am planning to start on this today... and over the weekend...

Hopefuilly I will have it up soon.

Edit - Just found those human elements so It will be alot more plausible now

If you went with the camera idea Bobba fett could shoot it and use return of the ewok footage