Yeah, the action of them clamping down is off-screen - we’re inside the Tantive watching Threepio, Artoo, and the soldiers reacting to the sounds of the clamps attaching to the ship.
Clip looks great by the way, Ady! I think maybe Artoo’s red/blue light flashes between colors a bit too quickly but I haven’t compared to the other films to see if I’m mistaken on that.