How do I paste on Mac? (an Animation to a folder)

I have this problem when im making my game (FPS Game) I am trying to duplicate my animation asset.
I added an Animation Starter Pack because I was watching a YouTube Video, link: [OUTDATED]How to make a AAA FPS From Scratch UE4 [EP.1 Set up And Animations] - YouTube

So I tried ctrl + w and nothing happened, thanks I you awnser!!