Storyline Interactions in RISE-Need quick help

I have created an interaction (7 slides) using the Serenity 06 Drag and Drop template. It imported into my RISE course fine and I am using it as a knowledge check lesson midpoint in the course. I have built a Continue button where the learner has to complete the block before moving on. When I import the interaction the Continue button is activated after completing 6 slides. Either the learner won't engage in the drag and drop interaction on the 7th slide or if they do, the slide just stays on the screen which I think could be confusing.  How do I fix this in my storyline build? What trigger should I use on the last slide in Storyline or do I need to build a blank slide?  

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