Usually after premium is generated I have to click the link, click transload, and then I can save the file.

But for example, with wdupload, after premium is generated I can just click the file name and download immediately. There is a 'transload' button that appears next to it.

So what is the difference? Maybe I don't understand.

Hello,

If you want, you can download it without transferring it to the server.
If you want, you can transfer it to the server and download it. Downloading to the server is more guaranteed and remains active for 20 hours.