It turned out I’d misunderstood the documentation: I thought the binaries had to go into Engine/Source/ThirdParty/Steamworks/Steamv128/, but they actually go in Engine/Binary/ThirdParty/Steamworks/Steamv128/. Oops!
It turned out I’d misunderstood the documentation: I thought the binaries had to go into Engine/Source/ThirdParty/Steamworks/Steamv128/, but they actually go in Engine/Binary/ThirdParty/Steamworks/Steamv128/. Oops!