Since April and even with the release of 1.21.6 realms is failing to upload to any world correctly. When it does finish the world can be opened but it is missing stuff and players and chunks at random are reset. I fully understand Mojang wants players to make new worlds each update and explore and play a new game and have a new experience but there are millions out there who just make a world and play it for years. I and all the player of my realm are one of them and we haven’t been able to play on our realm since april. Yes we can log into the realm, but it’s been a flatworld of boring for the past month.
I would like to return to my original world, and really don’t want this thread to be closed as a duplicate again. We, the community just want a resolution.
Environment
Java, 1.21.6, Realms
Linked issues
Comments 4
I’ve also faced the infamous “Upload failed. (504)” error.
It felt like a nightmare — I had tried everything. I even built a macro that would automatically attempt to upload the same world in a loop, but it didn’t help.
I tried trimming chunks, reducing the total size, renaming the save, restoring the latest backup — nothing worked.
But I think I’ve finally figured out what causes this error.
As you know, Realms servers verify your files after the actual upload is complete. However, Azure servers aren’t particularly strong, so they struggle to analyze or verify a large number of files — or perhaps they intentionally throttle this process to prevent upload spamming or server attacks. Either way, a timeout occurs during the verification process.
The “Upload failed. (504)” error is most likely caused by the number of files, not the total file size.
In my case, I had around 4,500 map data files in the savegame/data/ folder. After deleting about half of them, I was able to upload my save to my Realms server without any issues.
So I strongly recommend checking and deleting excess map_*.dat files or any other folders with too many individual files. For example, if many unique players have joined your world, you might also have a large number of stats files in the save folder.
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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I downloaded a world from realms now I can’t upload it. I really wish they would fix this.