Problem with hosting my new test website

Here is the article for the first problem:

(this same solution can also be applied to the generic 404 error page)

And here’s the article that explains the file size limit, what you’re experiencing when you upload your video:

So for the first problem try to create the htdocs folder or the folder through the File Manager or your FTP client. For the second problem, if you want to upload a video, either compress it or use a file/video sharing service and link to the direct file hosted by them.