1.2.9 with new Realm. Cannot upload even a simple world < 5 MB. It goes through the motions, the progress bar goes to 100%, it says "Done". And then when you hit play it just starts the same world as before the upload. Have tried restarting minecraft, resetting the realms world, and everything I can think of. Tried uploading at least 20 times. Never works.
Took a 180 subscription, will be asking for an immediate refund.