@MojangSupport I'm trying to upload a pre-existing world on Windows 10 to a new Realm. Every time I attempt it, the world will successfully export > get stuck on the upload screen > produce an error message.
This issue has been going on for years - please fix this.
We apologize for the inconvenience, but this is currently a known issue. The team is currently working on a fix that should fix the issue as soon as possible. Thank you for your patience while we work on the solution! ^TK