Your code is not correct. When calling filenames with HTML, a space " " is an invalid character, since a space is an invalid URL entity (Thats why you got a 404 error LoveBug). Please rename your video file to not include spaces.
And since you are still calling fade-in.css, the server and the filemanager are working perfectly fine. Before blaming other things for your problems, you need to be 100% certain about what the problem is.
I literally made a second account because the first one i cant comment for another 24 hours.
No, you’re wrong about this. If you notice in the source code, when I call on the picture, there are spaces in the name of the picture file and it still worked perfectly.
I think the problem was i had paid for the upgraded plan, and that sent me to a new hosting site, which pointed my site to a different IP. That’s why the files I uploaded to the Infinity Free file manager weren’t showing up on my site.