Hi,
I made my first game in unity https://play.unity.com/mg/fps/the-shexinator
When I uploaded it to play.unity.com and I test played I noticed that the video’s are not playing.
On my own server I am able to get the videos playing by using the following code
A more recent post on WebGL videos not playing when loaded via URL:
Edit: Your issue may be related to CORS, so make sure you check it. You might also try this (though including your videos directly in your build increases build size).