How to add models to an existing gmod server for everyone to see/use?

I am an admin on a friend’s gmod server and dislike all vanilla gmod models.

Q:is it possible to download a model (Garrus) into a server (or however it is done) so that everyone can see/use?

if so how? i am friends with the owner so if he has to do something that is ok

this thread has 63 views, why is everyone avoiding the question?

You need to have access to the server itself

i said that i have connections with the owner, so i do have access, i can have him do something if he needs to… : /