Hey, just make sure that you are using a ZIP archive, and that you created your archive by selecting the contents of your world folder (i.e. advancements folder, region folder etc.) and then created a ZIP archive out of that, and not simply compressing the folder itself to an archive. Also, I'd recommend you stick to alphanumeric characters for your ZIP file name, and then upload it directly through the Minehut panel via World Settings -> Upload World -> Upload File