1.6 game save on 1.8 mineos server

My server is up and running splendidly. My brother recently sent me a single player mc game folder with server.conf and server.properties etc. I’m not at the computer right now so I’m guessing those names but the folders and files he sent me seem complete. My question is what are the steps to get his 1.6 save on my 1.8 mineos server?

I put his folder and files in a tar. Then uploaded that tar to my mineos. Then imported the game, it moved the files to the servers directory but I cant see the server in mineos…

Any help is appreciated