Changing state of character when dragged and dropped over correct and incorrect targets

I am trying to have a character change state of expression when dragged and dropped over three separate targets. The character would have a happy expression when dropped over the correct target, and an unhappy expression over the other two incorrect targets. I added drop correct and incorrect states for the character, but am unable to drag or drop it over any of the three targets (I tried to build this in a freeform quiz blank template). I do not have a trigger for drag or drop that I am seeing, and nothing for changing the state of the character. I'm assuming I need to add some manual triggers or variables perhaps to make this work?

Not sure what I am missing, but if anyone could give me ideas about how to address this, I would appreciate it.

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