I was experiencing this same issue on 7/26 right after I purchased my realm (using Nintendo Switch), but it suddenly worked yesterday on 7/27. Here's the workflow:
Purchase realm
Click replace world (or go to create world -> use my realm)
Export of existing world is successful
Stuck on "initializing upload" before the error message.
Result varied. One time I ended up with a 0.0 MB world on the realm, which would result in an error message anytime anyone tried to join the realm. The furthest I had gotten was to have my world's seed successfully uploaded to the realm with none of my progress.
I was really frustrated by this, but last night I decided to try to replace the existing world again. On the first try, everything up to step 4 occurred. I then loaded up the realm to check it out and found that the world was successfully uploaded from my Nintendo switch. This seems very similar to CornerHard's 1.16.2 fix workflow, but of course 1.16.2 is not even announced yet.
I didn't really do anything special to get it working. My switch was docked and using WiFi. If you're experiencing this issue I will recommend that you keep trying each day and always log onto the realm even if you get an error while uploading because it may have actually been successful.
Ryan Yoder
I was experiencing this same issue on 7/26 right after I purchased my realm (using Nintendo Switch), but it suddenly worked yesterday on 7/27. Here's the workflow:
Purchase realm
Click replace world (or go to create world -> use my realm)
Export of existing world is successful
Stuck on "initializing upload" before the error message.
Result varied. One time I ended up with a 0.0 MB world on the realm, which would result in an error message anytime anyone tried to join the realm. The furthest I had gotten was to have my world's seed successfully uploaded to the realm with none of my progress.
I was really frustrated by this, but last night I decided to try to replace the existing world again. On the first try, everything up to step 4 occurred. I then loaded up the realm to check it out and found that the world was successfully uploaded from my Nintendo switch. This seems very similar to CornerHard's 1.16.2 fix workflow, but of course 1.16.2 is not even announced yet.
I didn't really do anything special to get it working. My switch was docked and using WiFi. If you're experiencing this issue I will recommend that you keep trying each day and always log onto the realm even if you get an error while uploading because it may have actually been successful.