In the case of some free cloud storage softwares have upload and download limitation. I am very angry and write this index page to direct access my files in my server.
No need for more operations than any other normal .php page.
Upload files simply in dir files or even in this dir via SSH or some
other methods you like.
Click dir to enter a dir in server. Click file to download the file.
You cannot use dir whose name contains '..' because I redirect any link contains '..' to avoid illegal access to server file system.