A friend of mine has an Aternos server and I want to make a replica, I downloaded the "world" "world_nether" and "world_end" files from his server and tried to upload them on mine. First I changed it from Vanilla to PaperMC, as my friend's server was and downloaded the same plugins to make sure. Then I uploaded "world" with no problems at all, but "world_nether" was not even generated so I could not upload it (as far as I know, didn't find anything on how to upload "world_nether" when it doesn't show up in worlds). To fix that I started the server and went to Nether just so it generates it. I turned off the server and tried to upload "world_nether" but it says that file is not valid.
On a similar Thread that is now closed a Helper said to download "world_nether" from the server, delete the "DIM-1" file from "world_nether" and replace it with the new one, but that was to fix an issue of uploading a vanilla Nether to a PaperMC server, I don't think this helps me.
What should I do?
Here is the other Thread: Can´t upload nether.