I have a big ~300mb survival world, and when I save and quit to the title screen, when it's done uploading the world, it says "World upload failed. Would you like to try again?". Sometimes it even flashes up a notification saying "Syncing world data succeeded", or something along those lines. And this world isn't a Realm, to top it off.
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Reisen Udongein Inaba
[Mod] EVGENSYPERPRO
Thank you for your report!
We're tracking this issue in MCPE-162455, 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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This issue has been open for quite a while; hmm.