Installing a map on Mineos Server?

I am trying to install a map on my server. I can access all the server files but the map is not working. When I load it in it is missing large parts of the map making the map totally unplayable. I put all the map files in the /var/games/minecraft/servers/map3/world folder but It is still not working. Are there any suggestions?

I would create a new MC server - Start it let it load. Then stop it.
I would then delete the “world folder” it created and then move the map3 “world folder” into its place
Try running it that way