I have created a knowledge check (single-slide, no layers) with 3 drag and drops, all 3 objects having the same drop target, but only 2 of them are correct to drop into the target. I've got all of that working properly. I've created a trigger that changes the state of the Next button to disabled when the timeline starts, but I cannot figure out how to ensure that the learner moves both correct objects into the target before making the Next button active. I've tried numerous scenarios using variables without success. I'm new to Storyline and would appreciate help. Thank you!