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To add mods you need the WorkshopID of the mod.
You can find this in the mod’s link.
Example of the mod Snap-Plus: https://steamcommunity.com/sharedfiles/filedetails/?id=3202759474
Here would be the ID: 3202759474
Call up the settings of your server.
To do this, click on the name of your server.
You can find the settings required for mods here:
Server settings -> Game settings -> Mods (automatic installation via Steam Workshop)
Enter the WorkshopID for your mods here, multiple ModIDs are separated by ;
.
Click on Save and restart your server.
Info: Even with active mods, the server is listed ingame as unmodded.