Realms exporting worlds fails every time.

Every time I try to replace my realm world, it says failed. Additionally, the progress bar number says 0, but the bar itself goes up. The world I tried to upload is 104.02 MB. I tried other worlds, but the same thing happened. I hope that I can upload my world soon. It also says that it was successfully done in the top-left corner of the screen. This happens on all platforms.