Core KeeperGuideYour Core Keeper world can move to your server. Power the server down, open the Backups card, click Upload World and drop in the folder named with your…
Your Core Keeper world can move to your server. Power the server down, open the Backups card, click Upload World and drop in the folder named with your Steam ID (or one world file, like 0.world.gzip). The world on your server is saved as a backup first, then replaced by yours. Characters stay on each player's PC, so everyone keeps their own.
Press Win+R, paste %USERPROFILE%\AppData\LocalLow\Pugstorm\Core Keeper\Steam, and press Enter.
Open the folder named with your long Steam ID. Inside, worlds holds one file per world: 0.world.gzip, 1.world.gzip and so on. The one you played last has the newest date.
Next to it, worldinfos holds each world's name and mode. That is why the whole Steam ID folder is the best thing to upload.
Moving from your own dedicated server on Windows? Its worlds are in %USERPROFILE%\AppData\LocalLow\Pugstorm\Core Keeper\DedicatedServer\worlds. Played in a friend's world? It is saved only on the host's PC, so ask the host to upload it.
Power down your server. Upload World is disabled while the server is running.
Open the Backups card and click Upload World, next to New Backup.
Drop in your world. Any of these works:

the folder named with your Steam ID, dragged in whole;
one world file (.world.gzip), or a world file and its .worldinfo picked together;
a ZIP, RAR, 7Z, or TAR.GZ of any of the above.

Click Upload and replace world (on a brand-new server with no backups yet, the button reads Upload world) and wait for the import to finish.
Power up and join as usual. Your world loads now and at every later start.
Setting up a brand-new server? Switch on Upload Existing World during setup and drop the same files there.
Your world replaces the server's world. The world that was on the server is kept first as Backup before world upload in the Backups list. Restore it any time to go back.
Nothing else changes. Admins, bans, the password, the Game ID and your other settings stay as they are (World Mode aside, below).
Characters stay on each player's PC. Core Keeper keeps characters apart from worlds, and every player brings their own to any server. The upload leaves character files out.
Several worlds in one upload: the one you saved most recently is used, and the dashboard names it. To use another, upload just that world's file.
Mode: the server runs the world in your World Mode setting. When your upload includes the world's worldinfos file (it is in the Steam ID folder), we set World Mode to the mode the world was made in for you.
No world in the upload: the upload is refused and nothing on your server changes.
Your upload did not include the world's worldinfos file, so the server kept its own World Mode. Upload the world again together with its worldinfos file, or upload the whole Steam ID folder. That sets World Mode to the world's own mode and changes nothing else.
Renaming your world file to 0.world.gzip first. The upload puts any world in the slot the server loads.
Uploading your saves folder. It holds characters, not worlds.
Uploading a file from the game's backups folder when a newer copy is in worlds. That is an older copy of the same world.
Reach us on Discord or at support@haptic.gg with your server name and the exact message under the upload box.