Edit Humanoid Animations

Hey folks!

I want to animate a human in Unity and edit the animations.

The animations, I got from the Asset Store, are working with my human model. But now I want to edit this existing animations (e.g. add an animation for the jaw). But it seems that I can’t edit this animations.

How to edit humanoid animations?

Regards

I am still searching for a way to edit human animations. How do you deal with this?