When I try to upload my map to Minecraft Realms, I get the error message "upload failed -1" There is a limit to how much I can upload so I would have to wait a couple of days to try again. I purchased the Realm on Sept 6, 2014 and till today I still haven't been able to upload my desired map.
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Duplicate of MC-63646. I suggest you give some more information over there, as @unknown is trying to fix it, but needs more information.