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by MisterTea 2251 days ago
Servers can distribute custom maps and assets to players so there's a mechanism to download files to a users computer.

As for uploads, players used to be able to set custom models in quake 2 which were distributed to other players on the server. Though I am not sure if that was done by server admins in special cases for clan payers or members or if there was an actual upload mechanism in the game engine.