Is is possible to attach a weapon to a socket without using blueprint?

As the question asks, I’m trying to add a weapon to a socket of a skeletal mesh to use in matinee but i cant find a way of doing it without having to make a blueprint of the character.
https://docs.unrealengine.com/latest/INT/Engine/Content/Types/SkeletalMeshes/Sockets/index.html#permanentattachment This shows a way of permanently adding a weapon, but i cant seem to get it to work (is it outdated?) Any suggestions would be greatly appreciated.

This seems like a legit question to me… can anyone answer?

Yes I can not get it to work either. It just says preview only