Look, I did my research as best I could. I looked through the forums, I searched online.
I DON'T KNOW WHAT I'M DOING WRONG.
Both the .zip file and the world folder are named "world", minus the quotation marks. I've attempted uploads at least 15 times for both, no luck whatsoever.
Error codes I've gotten are 105 and 107.
Additional note: This server had bukkit plugins already installed, and I'm working to see if I can get the same ones here to see if that will help my problems.