Start page thumbnail for Mobile Safari

Hi - the Start page that appears when you run a Storyline HTML5 course on Mobile Safari includes a thumbnail of the first slide of the course. Is there any way to substitute a different thumbnail? The first slide of the course I'm working on starts with a white overlay that shrinks, so the thumbnail on the start page is just a white block. I'd be interested to know if there's a file in the published content that I can swap out for a more appealing image.

Thanks!

Patrice

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