What has been routine has me scratching my head

Articulate user for years.   Now an Articulate 360 user.   All has been working until today.   In one PowerPoint I have inserted two very short mp4 videos.   They play perfectly in PREVIEW mode.

Once published they do not play.  The bar moves across the slide but no video.

I have configuring all in my main C drive.  


Slides 40 & 41

Resolution ideas are appreciated.



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