Build an Accessible Drag and Drop Interaction in Storyline

Hello - I have attempted to follow this after having one of my projects sent back because the drag and drop was not accessible for people who can't use a mouse. I've spent all day copying this but I can't seem to get it to work. I'm having the following problems:

- When I preview the slide the objects stay at the end of the motion path instead of stacking neatly within my drop target which they would do when the drag and drop interaction is done with a mouse. Therefore, they all stack on top of each other at the end point of the motion path and the user can't see what they have put where.

- I had set the drag and drop items to be revealed one at a time, however when the user has selected the drop target for last item, the next one does not appear. There doesn't seem to be a way to un-select the item.

I deleted the slide and have created a drop down list interaction instead, but I was just curious if anyone could tell me why I had the above problems with that fix? I will probably want to use a drag and drop again and will need to make it accessible (I don't have time with this project so just need to find a quick alternative now)

Any thoughts or ideas would be much appreciated!

Danielle