In the movie, Star Trek IV: The Voyage Home, the Klingon ambassador shows a video clip of a Klingon boarding party on the Enterprise. This was seconds before the Enterprise self-destructed.
How did the Klingons get that video?
The Enterprise was gone along with its computer banks so the video should not be accessible by anyone. And even if the ship hypothetically survived, the Federation probably would not share that video with anybody because of the sensitivities around the entire Genesis Project.
Does the novelization or any canon sources provide an answer?