Need a character to pick up a gun, knife, or even a banana? Or need to attach an object to random part of a skeletal mesh? Learn how to create sockets for a skeleton, and animate objects attaching and detaching to them in the Sequencer.
https://dev.epicgames.com/community/learning/tutorials/wrVn/unreal-engine-use-attach-tracks-to-pick-up-and-throw-stuff-in-sequencer