Video Embed on Slide Layer

I'm trying to achieve a "video playlist" using Storyline 2 where the user can click thumbnails on the base layer to launch layers that have different web videos embedded. 

Problem is when I'm on a layer, I can't click the base layer thumbnails to select a different video, even though the "Prevent user from clicking on the base layer" toggle is not selected. 

Is this a known issue or could I be missing something?

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