Unable to properly upload worlds to realm

I have a saved world locally on my iPad (latest iOS). When I go to upload this world (73.4MB) to the realm, I am presented with an improperly formatted warning message and then the upload fails every time. However, with successive attempts, there are indications that the process is partially successful. The first time, a world block on the realm will be filled with no data. The second time, the name will be accurate without the data. A fix would be greatly appreciated.