You guys said it supports maps up to 5GB, but I tested 70MB, 250MB, 500MB, 1GB, 2.1GB maps, and all of them were unable to upload. However, very small maps (eg 0.1MB) were successfully uploaded.
(I have already removed all resource packs and behavior packs.)
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Thank you for your report!
We're tracking this issue in REALMS-474, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote to the main ticket it would be appreciated. Please only comment on that report if you have new information.
Some have reported success if they remove resource packs, particularly any that don't have "Minecraft" as their creator, before attempting the upload.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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