This article is how you would upload unturned workshop content onto your server, this includes maps, texture packs etc.
First off, Subscribe to the workshop content normally on your PC.
On your PC navigate to your Unturned workshop folder in SteamApps/workshop/content/304930.
Copy items/objects/vehicles from there to Bundles/Workshop/Content on your server (upload by FTP or the File Manager).
Copy maps from there to Bundles/Workshop/Maps on your server (upload by FTP or the File Manager).
Make sure you copied the #### folders, not just their contents, for example 304930/12345 should move to Content/12345.
Make sure that the server loads any custom map from the Bundles/Workshop/Maps folder rather than the default Maps folder.
First off, Subscribe to the workshop content normally on your PC.
On your PC navigate to your Unturned workshop folder in SteamApps/workshop/content/304930.
Copy items/objects/vehicles from there to Bundles/Workshop/Content on your server (upload by FTP or the File Manager).
Copy maps from there to Bundles/Workshop/Maps on your server (upload by FTP or the File Manager).
Make sure you copied the #### folders, not just their contents, for example 304930/12345 should move to Content/12345.
Make sure that the server loads any custom map from the Bundles/Workshop/Maps folder rather than the default Maps folder.