World Problem

I use multiverse and I am uploading a map to put on my server as the default world (since with Aternos you can't upload more than one world on Multiverse).
I got a map but it downloaded from the internet as a .rar file and I extracted the files and then put them into a .zip file. Then I uploaded it but when I started my server and went on the world was empty and there wasn't even an overworld. To make sure it wasn't a problem with the file I put the extracted file (not the .zip one) into my saves folder (.minecraft)
Then I restarted minecraft and the world was working in my SinglePlayer.
This means it is most likely a problem with Aternos world upload or my .zip file.
Can someone please help and tell me how to fix this.

BTW it usually works when I do it with other maps/worlds
SO WHY TF ISN'T IT WORKING NOW?!?!

So far the only thing I found is this:

... Yes... ITS A FLOATING SEA TEMPLE

I have TRIED upload another 4 times and it STILL WON'T WORK.
SOMEONE PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Edit: there is one thing that could possibly be an error (from the console). It is [07:19:43] [Craft Scheduler Thread - 3/INFO]: [P2] Invalid playerdata: adf0860c-555f-44b9-9930-9fb2410d8c02.dat

There is also a lot of weird stuff that I took screenshots of here:

What I believe happened is that Aternos didn't upload the world properly and only a bit of the world has loaded

Don't worry. The one I uploaded onto my minecraft singleplayer, I zipped it and it then worked.