I wanted to upload a new world to my server, and I followed the video tutorial to do so. When I downloaded it, it said download complete, and displayed the correct amount of MB. It even shows up in the file manager. However, when I try to join the world, using /world ul_CastAwayII (The name of the world) or by doing /worlds and clicking on it (it shows up in the list) it says "That world does not exist!". I tried restarting the server as well. Someone please help me with this.