Problems uploading a mp4 video to storyline 2

Hi

I just uploaded a 14 slides training on the a test environment (LMS SUMTOTAL) and everything works fine except the video. It does not appear on the slide, just a white slide.
(I imported a mp4 file(170,603 kb) to the training.)

I uploaded the training to the Articulate Tempshare, everything works fine including the video. I open the Storyline output – Story.html, Its fine too.
Any suggestions….

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