I download the world to replace maps for inserting images. If I don't open the world while downloaded it actually can be uploaded again. If I open the world in single player while downloaded - it fails. So something happens when opening it.
I'm having this issue now. All the items here say it's resolved, but maybe not?
I download the world to replace maps for inserting images. If I don't open the world while downloaded it actually can be uploaded again. If I open the world in single player while downloaded - it fails. So something happens when opening it.