Created animation not working on model

I downloaded a model from Mixamo, along with its animation and all is working. I just wanted to create an animation in unity (Create->Animation) which simply moves the z-axis. I used key-frames to do it, very simple. Except when I put it in the animator it doesn’t work. If i would for example use it on a 3D cube, it would work, but not on the model, nothing moves when the animation plays in the animation controller. Any suggestions?

the rig is set to humanoid. Change to generic or legacy and it might work. Humanoid is for externally created animations.