[Help Wanted] Transferring Moon keyframes

Help needed

I’ve made this gun animation using Moon Animator,-

the problem, is that I want to copy and paste the keyframes into another humanoid but I don’t know how to.

For example, putting these Idle keyframes image

Into this Shooting animation image

Basically transferring the keys over.
How do I do this?

Have you tried to copy it by shift+C and paste using shift+V yet?

Yes I have. It just pasted it back into the same animation