Ok, I uploaded a .MP4 video file to the gallery and I included it in a thread.
On the iPhone safari browser it loads the video, but on chrome and IE on my Windows 10 Pro pc, it says invalid extension (on IE), and NOTHING shows up besides the play, pause bar (on CHROME)
It is a small 0:37 second video clip and it loads just fine on the phone. Just figured I would see if anyone could replicate this.
Was the video filmed on the iPhone?
This might be an issue with the codec, after all mp4 is just a container type and not a video format. If it helps, think of mp4 as being a can, you can stuff pretty much everything into it and it will still be a can, but two cans are not guaranteed to contain the same things.
It would be worth a try to see if it works, it would also help us to identify if my assumption was correct and this is a codec-related issue. Otherwise you'll have to wait for Matthias Schmidt who's a bit more into this topic than I am.
I have tested the described problem with an MP4 file and I am unable to reproduce the problem using Chrome (using macOS).
Please report back if you should encounter the problem with another video 
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I am reproduce the problem using Chrome (using macOS).
So you are reproducing this? Then, why this status?
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