Why is my background video not playing on my Broadcast theme through my mobile Shopify store?

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My video works fine on the desktop version of shopify. I opened up a support ticket and the demo video they gave me works fine on desktop & mobile. My video is 1:01 minutes long, are there any other requirements with the mobile Broadcast theme that would prevent the background video from loading on mobile devices? 

Please help! Really wanting to launch my store but my marketing will be heavily social media based so I absolutely need this video to play on mobile devices before I launch.