This is an animation, done in Fusion 360, to test the foot of the ramp, which flips down and up when the ramp opens and closes respectively.
This could be a version that works but difficult to motorize at the scale of the Deagostini model. I am not even sure it was motorized in the movie sets.
Millennium Falcon (Deagostini 1/43)
X-Wing (Bandai 1/48)
AT-AT (Bandai 1/144)