Replying to @SnowyArctica
Are you still having issues at this time and if you are can you tell me what troubleshooting steps you have already tried? ^TK

Dec 21, 2022 · 10:09 PM UTC

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Replying to @MojangSupport
Yes, I'm still having issues. I've tried restarting my console, restarting my router, and using a smaller world. It didn't fail, but a freshly created world was loaded instead of the one I selected.
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I'm gonna send you up to our Realms team! I would try a couple more times of uploading the World though. To keep your information secure, please complete our request form at aka.ms/Minecraft-Support so we can quickly and safely assist with your question! ^TK