Subdomain file structure

I just setup a subdomain on my account a few days ago. I want to use the subdomain to upload clients sites so they can view them as i work on them. i called my subdomain test and cpanel created a subdirectory in my files called test. When i uploaded a test site there I could only view home page(index.html). When i clicked on other links it says file can't be found, it was looking for file at subdomain/test. I got on support chat yesterday and the guy made a file under the main test subdirectory called test. This worked for the first link. Each successive link added another test file to the url e.g.; subdomain/test/test/test and so on. What do i need to do with the file structure for the subdomain for clients to view their sites. I was under the impression that if I uploaded a site to the test subdirectory for the subdomain it would read file names such as about.html when the link for about.html was clicked, but this is not what happened.