Video won't play

Hi everyone - I have multiple issues with this presentation...

I've inserted a video file (MP4) at slide 14 in my 28 slide presentation. On publication , I'm having one of two issues when previewing: either the video won't play at slide 14 or I get to slide 5 and can't move any further (I'm seeing a little padlock icon when I get to that slide). Any ideas?

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