Edit Drag and Drop Missing

I guess I'm unclear as to what you are seeking. To identify drag items and drop targets, go to Form View. Every item on the slide is available as a drag Item if it hasn't already been added to the target list. Conversely, adding an item to the drag list is the only reason it is unavailable as a target item.

If you are looking for built in states, they are automatically added to drag items that are added to the drag list. Of course, if you create a trigger to change to Drop Correct, or Drop Incorrect, that will most likely interfere with the built-in action.

At any point, whether an item is a drag item or not, you can edit its states and add Drop Correct and Drop Incorrect. If the item is not a drag item, you will need to create a trigger to change it to one of those states. Since they are not drag items, there is no built-in action to cause conflicts.