Ah OK, could'a been the Glider I remember too.. Honestly don't recall the Engines..
Just remember film of the Clam shell doors swinging open, guys hopping out to guide the Bifold ramps down.. Ramps supported by a cable pulley under the cockpit.. Then a Panzer III
driving out and down the ramps..
Thinking harder, the film was circa Summer 1940, buildup for operation Sealion period, and it was a Pz3 with a 37mm.. I have seen it multiple times, but haven't found it in my collection.. Damn, I hate that!