I tried to add audio into my creative map and now I cannot access the map on fortnite just UNEF

Summary

How do I get my map back into fortnite to work on it, I cannot access it anymore since going to UNEF and adding a sound, I was just trying to add a death sound to the game now the map is gone in fortnite.

Please select what you are reporting on:

Creative

What Type of Bug are you experiencing?

Assets

Steps to Reproduce

Convert my map back into creative so I can continue editing, and add a warning that states you might not be able to go back into fortnite creative and work on it.

Expected Result

Being able to have my map back into fortnite creative.

Observed Result

COnvert my UNEF map back into Fortnite creative.

Platform(s)

windows