html5 - Embedding Video in O365 Site -

I have a video that I want to embed in an O365 website using the HTML5 embedding code. When I insert it, the video works fine, but as soon as I click on saving the video area it is just a black box and I can not play it. If I click to open it in another window then it plays well for some reason.

The code I'm using is the following:

  & lt; Video width = "320" height = "240" control & gt; & Lt; Source src = "my video.mp4" type = "video / mp34" & gt; Your browser does not support the video tag. & Lt; / Video & gt;  

Any idea why this is happening?

While my question is valid because I do not know why this is happening, I have the same problem Got a job for any person

Instead of inserting the HTML embed code, I inserted a media web part which was very easy and worked! I recommend this route!