And don't forget to place the corresponding map files (.pms or .PMS) in the maps directory along with the scenery (which needs to be placed in the Scenery-gfx folder).
Since you're running a server with custom maps, also make sure you opened your soldat port + 10. That means if you're using 23073 as your Soldat port, 23083 is used for file transfer (maps and scenery).
Grtz, DePhille