ARK keeps the world, the players and the tribes in separate files. Copy the world without the rest and everyone loses their characters, so take all of it.
- Stop the server from the Console tab in the panel.
- On your PC, open
...\ARK\ShooterGame\Saved\SavedArks. - Take the map file (
TheIsland.ark,Ragnarok.arkand so on), plus every.arkprofileand.arktribefile. The profiles are the player characters and the tribes are the shared bases. - In Files, go to
ShooterGame/Saved/SavedArks/and upload them all. - On the Startup tab, check the map name matches the
.arkfile you uploaded. If it doesn't, the server makes a fresh map and it looks like your save has vanished. - Start the server. The first start on a large save is slow, so give it a few minutes before deciding it's stuck.