Can't upload my own world. [En/De]

Hello there!

I wanted to upload my own world on my server but it actually doesn't work.
My world isn't larger than 50 MB and it is a zip folder. But if i upload it, the old world, that was already on my server, is still there.

I've already read some threads but they aren't exactly the problem, that i have.
Does someone know, what i should do to upload my single player world without that problem?

Thanks for every answer.

Quote from Roman

Which browser do you use?
Do you get a error message?

I use chrome.

No. Nothing. It seems like it works, but it doesn't.

Quote from Roman

Is there a tick next to the upload button when the upload has finished?

Yes. Like i said: It seems like it works, but it doesn't. No error and the tick is there. I just don't know what i'm doing wrong.

Quote from Roman

Please make sure that the world is directly in the first layer of the .zip file and not i a Sub-Folder.
Also remove any special characters from the world folder name

Okay. The problem is fixed. Before i've created the thread, i just changed the name from the zip file but not from the world... Now i've changed the world name. Thanks for the help!