Can't upload world to a realm Minecraft

I am trying to upload a world with a datapack to my realm so that that realm may have a datapack. This stopped at 2.4% and then said “Upload Failed! -1”
This made me think I jsut couldn’t upload worlds with datapacks to my realm. So, I created a completely new world called test, and then I left and attempted to upload THAT to realms. It failed, stopping at 2.4% again with the exact same error message. I can’t upload ANY world to my realms, which is really annoying. Is there a way to fix this?

My internet is fine, but I can’t test this on another device for the time being. My firewall should be okay, it’s fully open for Minecraft. I can create new worlds, but I just can’t upload any.