Drag and Drop Submit button and move to next page

I created a drag and drop slide that works great.  However,  when the learner gets all the files correct it will not allow them to move onto the next slide.  I checked the box to have the submit button come up but it is allowing them to skip the drag and drop activity completely. I want to learner to have to complete before he/she can move on. 

Can someone show/tell me how I can get this to work so that the user has to complete the activity before moving forward?

 

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