How to set control so the recording plays after the drag-drop is done?

Hi heros, 

I'm creating a software simulation in Storyline 360. All the hotspot slides are taken care of by SL, but I ran into a trouble when I created a drag&drop slide.

I have a screen recording in the slide, and I'd like to let users do a simple drag & drop then see the video starting to play, just like how the hotspot slides work. Right now the video will start playing before I drag & drop. How can I copy the behavior from the hotspot slide? 

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