How do i upload my end world to the server? i

Which server software and version do you use?

Go to the Worlds page, find the End and click on "upload".

You can then choose to upload a folder a zip file.

If you do not see the End and the Nether on the Worlds page, you need to do it differently;

Go to the Files page, open the "world" folder and delete the "DIM1" folder. Now rename your End world "DIM1" and upload it in the same folder you just deleted the auto generated one.