Can no longer upload a world to realms

For a significant length of time now I have been unable to upload my world on to Minecraft realms. I have tried copying and uploading copies, deleting, uninstalling, Exporting the world and uploading it on a different device, nothing seems to work to allow the world to be uploaded. The whole exporting and uploading process appears as if it has worked and runs smoothly, it is only once it gets to the very end and "An error occured" message apepars, giving no details and seemingly no solutions. Completely out of ideas now. Ive tried countless times, in many different situations always goes the exact same way.