Upload Failed (-1)
I had this issue with my last realms subscription. It says "Upload Failed! (-1)" in red text after getting less than 1% into the world upload. It doesn't let me upload any worlds, in any slots from my single player worlds. I thought a new realm would help but it did not. I have no idea what to do, and any other forum with this topic doesn't give an answer.
UPDATE: SORRY GUYS, okay I found the issue. It wasn't your fault at all, it was my parents actually. They have this really dumb thing installed on our wifi called Disney Circle and I guess it blocked me from uploading stuff to minecraft realms for some reason. So if anyone else has this error, maybe ask them if it is being blocked by some sort of filter. You can mark this SOLVED or whatever.
To anyone else whose parents hate you and are stuck in my situation, message me and I'll tell you how to get around the filter system. 
Environment
Tried on 2 different computers. Windows 7 and Windows 10.
Attachments1
Created Issue:
Upload Failed (-1)
I had this issue with my last realms subscription. It says "Upload Failed! (-1)" in red text after getting less than 1% into the world upload. It doesn't let me upload any worlds, in any slots from my single player worlds. I thought a new realm would help but it did not. I have no idea what to do, and any other forum with this topic doesn't give an answer.
Environment
Tried on 2 different computers. Windows 7 and Windows 10.
Attachments1
![[Mod] Pokechu22](../../../data/avatars/users/92931.png){kind=small}
MC-124845 → 
REALMS-893I had this issue with my last realms subscription. It says "Upload Failed! (-1)" in red text after getting less than 1% into the world upload. It doesn't let me upload any worlds, in any slots from my single player worlds. I thought a new realm would help but it did not. I have no idea what to do, and any other forum with this topic doesn't give an answer.
UPDATE : SORRY GUYS, okay I found the issue. It wasn't your fault at all, it was my parents actually. They have this really dumb thing installed on our wifi called Disney Circle and I guess it blocked me from uploading stuff to minecraft realms for some reason. So if anyone else has this error, maybe ask them if it is being blocked by some sort of filter. You can mark this SOLVED or whatever.
To anyone else whose parents hate you and are stuck in my situation, message me and I'll tell you how to get around the filter system.
Moved to REALMS, as that's the project for realms specific issues. Unfortunately I myself don't know much about realms so I can't help you, sorry :/
I know there is lots of other issues/bugs but this is kinda important since I can't play on the world I want to. I'd have to start a brand new one if I wanted to play. Maybe it's unsolvable but it's kinda sad since I bought realms specifically for this reason. I won't be purchasing again if it doesn't get fixed...
Edit: sorry I was grouchy haha, problem is solved read the description.
Resolving as invalid since this wasn't an issue with realms itself. Good to know that that's a possible cause, and yeah, web filters suck :/