Completely close out of Minecraft and reopen the game
Sign out of your Microsoft account, then sign back in
Try to upload/download the world again
If you find that the upload/download is finishing almost immediately, this means that it was unsuccessful. Please note that you may need to try again more than once.
This is the solution proposed by the support team
It's not working at all
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Completely close out of Minecraft and reopen the game
Sign out of your Microsoft account, then sign back in
Try to upload/download the world again
If you find that the upload/download is finishing almost immediately, this means that it was unsuccessful. Please note that you may need to try again more than once.