.mp4 videos won't play online

I have successfully published a course for the Web and QA'd on my local machine.  I have several .mp4 files that I have inserted into screens and they play without a hitch locally.  However, when I upload them to a subfolder on my site for client review,  the controller on the screen just reads "Paused" and the files won't play.  I checked my site and the files seemed to have uploaded properly.  The presentation.xml file seems to refer to the correct filename as well.

Can anyone help?

Thanks!  Kraig

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