How do I set up FastDL for a Garry's Mod server?

to get fastdl for gmod server, go to garrymod/lua/autorun/server --- then create a new file, write workshop.lua --- and to let players download them . create something inside . resource.AddWorkshop ("Workshop id")

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if you havnt added the auth and collection id, for the server. go to server panel. command line manager > custom commandline > create one ///

have you created the collection for it. if not create one on the workshop. need to be signed in and create one > then add the collection id on the custom command line ( collection need your workshop id the thing you want to add. )
( also go to the workshop addon you wanted to add will say add to collection. and select your collection. ) and subscribe for you to be faster.

if you have not connected authentication for it, http://steamcommunity.com/dev/apikey - copy your auth and put it on the auth on the custom command line