I cannot upload a previous world to my minecraft realm. Why I try replacing it I get a popup that says "an error occurred" I paid for realms plus and I can't play my own world on the realm. Please help.

I have this issue aswell, doesnt work from android either, the error occurs during initialisation of the world upload and the error doesnt specify any details

Thank you for your report!
We're tracking this issue in REALMS-474, so this ticket is being resolved and linked as a duplicate.

If you would like to add a vote and any extra information to the main ticket it would be appreciated.

If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned. For example, a search for "upload error occurred" would show the main ticket for this issue.

Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki – 📖 FAQs