Question Can't edit the actual animation clip while using timeline

I'm using the timeline package to animate two objects at the same time so i can sync their positions, but can't add keyframes to the actual animation clips being used, only if i disable the timeline preview and enable the animation preview, but then i lose the preview of the other object. Is there something i'm missing or is timeline used to place complete animations on a timeline and not actually editing the animations? In that case is there some other option for me to see both actors' animations at the same time?

pressing the add key button does nothing, both actors' root parent object has the playable director component