Ok. So that works for playing footage inside a matte. I now realize I actually have a different problem. I want my truck to drive across a still frame of a logo. My 3D guy provided me the truck element and a separate matte layer (hold out) that syncs up with the movement of the truck.
In avid, I just put the two layers on the timeline and use an inverted key on the matte layer and it keys out the truck and I can see the lower layers around the truck. But that isn’t working in FCP.
Does that make sense? I’m not sure how else to describe this.