Auto rotate a basepart/model doesn't work

When i select and hold a part/model and put in another part it doesn’t rotate, idk how to explain sorry but maybe this image can explain better


why does not the model rotate ?
image
it should be rotated like this

I think you mean automatic rotation when grabbing a part? It will approximate to the nearest face and in your first image the side face of the holder thing is closer to the wall than the circle base. It’s better to get used to manual rotation by the way.