If you have a Realms account with 3 open worlds available. You then go to Replace a world with one of your local ones. The world replace will successfully export the world. On the screen where it starts to Initialize the upload, it will freeze there. After a few moments, you will get a pop-up box that just says "An error occurred" and nothing else.
This happens on Pocket Edition as well as the latest on Windows 10. Creating a new Realm world and paying for it works fine. using the 3 available slots in the Realm does not.
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We're tracking this issue in REALMS-474, so this ticket is being resolved and linked as a duplicate.
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