hey guys! i found a solution that helped me:
go to software information on the switch and backup your save data to the cloud, after it is backed up archive the software. once that’s done re-download minecraft. once it’s redownloaded your worlds should still be there if you backed up the data. i was able to replace the world once i played in it for a couple minutes. it did still say error occurred when i upload the world, but it still replaced it. i had to do it multiple times because it would just upload the world seed with no progress, but eventually it worked. hope this helps!
My realm only uploads the world seed but with no progress. it’s just the seed. and when upload it says export successful on the top bar that shows up, but it gets the “error uploading” message when it’s initializing. is this a bug?