It succeeds when uploading a world with nothing, but fails with an error of 504 when uploading a world with a data pack. I put only 1 data pack.
Linked issues
Comments 2
Thank you for your report!
We're tracking this issue in https://report.bugs.mojang.com/servicedesk/customer/portal/2/REALMS-12617 , so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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Goods news, 1.21.7 is out, bad news is that this 3 month old error is still happening.