Ah, I see. What happened was I overlooked the chest thing itself. This is simpler than you think, and if you watch this, in 10 minutes you’ll be flying through this process. Take a look at this quick video, skip the parts you know… and you’ll be an expert in no time 
ps Yes montages require skeletons, that was my bad, I thought you had basic skeletons. It’s just sequences for this purpose. Not montages.
Disclaimer: This video is not associated with Epic Games, Unreal Engine, or their partners.