How to add key on custom timeline?

I developed a custom timeline for my avatar, and I want to add keys to modify avatar’s skelenton transform.

I tried the Animation Track, but it can only add Keys that record the transfrom of the binding target, the avatar. It cannot record the transform info about avatar’s skelenton.

Can anyone help me out?

Thanks a lot!

The animation track does not support keying transforms of humanoid avatars (other than the root) - only imported animation is supported - but it does support keying transform for generic avatars.