Video layer starting up on slide start, and then ending auto

I am really new to Storyline, and have been trying to figure this out for a while now.

I have created a new layer, that has a box, with a video on top of it (so two object, the box, and the video = 1 layer)

I want that box to start when the slide starts, and then disappear when the video is over and show the base layer objects.

I have set the timeline on these two objects to run from the start of the slide, out to 12 seconds (which is the length of the video). However, when I preview the slide, this video and box layer don't appear at all.

Suggestions?

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