Question regarding Drag and Drop activity

Sure - one solution is to  create  a trigger to show a layer under certain conditions when the next button is pressed. You can also edit the existing player trigger to advance to next slide only if certain conditions are met.

Now, what conditions are we talking about.:

I would create triggers on the objects that change the state of the object to "Drop correct" when the user drops the object on the correct spot.

Then I would set conditions on the player trigger to go the next slide if  all of the objects' states = "Drop Correct"  

The conditions for you trigger to show the the layer would be if any of the objects' states are not equal t "drop correct"

See Images:

Thanks Ron! Awesome! I was on the right track, the only part I was missing was setting state trigger to each dragable object.