I'm having some difficulties uploading a world to my server. I've tried using the in-game and via website uploading process but they don't seem to work. When I upload in-game, it says my files are invalid. I am using mediafire because 100 megabytes isn't enough. When I upload via website, it says it gets the files, but it doesn't transfer to the world. I have used /worlds and it still doesn't show up.