I have been trying to upload new world to my realm for almost a month now and it hasn't been working. It will initialize the upload. then the green bar fills up but never actually finishes.
The issues has been around since 1.12.1 and was not fixed in the 1.13 update.
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[Mojang] Banjo
migrated
We have a lot of issues reported on failures to upload. Duplicating this to be tracked in REALMS-474.