Dimension files

Alright, so, I'll make it quick. I've downloaded a map called Skyblock EVO, and I'm on a paper server. I knew that Paper servers aren't compatible with regular nether and end worlds, so I decided to go into a regular world and copy the DIM-1 file, And when I tried to enter the https://aternos.org/files/Skyblock_Season3_nether world file, It gave me this.

It gave me an Access Denied message, and I want to understand why you'd deny access of a server's files to their owner, Because I need to insert the DIM-1 file into it, When looking at the homescreen of the files menu, It shows me no _nether and _the_end files, But they still exist. Why can't I access them?

But the issue is, it didn't fix it, The moment I uploaded the world from the beginning, It had glitched the nether and end, Why can't I just access directly inside the end and nether files to insert stuff in?

And I've already spent 2 or 3 weeks on this world, So I don't want to just overwrite it all

Wdym it generates when I start the server? As in, That folder is only there when the server is online? I've seen other server files, and they have both the_end and _nether folders, Also, I just turned on the server and there are still none even though it's online

But as shown by the screenshots I showed you, there are neither DIM-1, DIM1, _nether, or _the_end, And it shows a different error message when I try to enter DIM-1 and DIM, it just shows file not found instead of access denied

No, I made them after starting up the world and entering the nether and end, in aternos.org/worlds, there are a nether and end dimension, but they aren't in the files

and the original world file, there were DIM1 and DIM-1 files

Yes, they're on the worlds page, but not in the files

So it's just clientside for me?