I'm sure this is possible. You can find a few custom maps here, which you can download without steam: Call of Duty: Black Ops 3 Mapping | CabConModding
Ok, thank you. I will ask @SCP about it.Here
tried changing folder name in workshop.json + the actual folder name?Is there any way to rename the maps so that they don't all show up as zm_mapname (for example)? Changing the folder name just makes them not show up. It would be nice to have a tidier list in game.