Sticking a dropped object on a moving target

I haven't tried this but I think if you add a Drop Correct state to the moving target and paste a copy of the object you want dragged onto the target in the Drop Correct state, you could achieve what you're trying to accomplish. You will have to use something different than a hot spot (perhaps a 99% transparent shape) as the moving target since hot spots don't have states. Once the object is dragged to the moving target, have a trigger fire to change the state of the draggable object to hidden.