Upload Failed (500)

Okay so this is still a problem that has not been fixed. When I try to upload a world to realms I get stuck on verifying and then I get the message "Upload Failed (500)" This needs to be fixed. The other post I made had gotten marked a duplicate and was linked to another post, which has been up for a year and still does not have a solution. It's really frustrating to point out a problem, only to be shut down by the only people who know how to fix it. I'm on a secondary computer now using a different network and I get the same problem, so I know it isn't on my end. Please fix this.