New animation for controller doesn't work

Hello, can you help me please?)

I added some new animations from mixamo to my current animator controller. I set transition from Itle state to the new animation’s state. But when I preview the transition I see my avtar falling under the ground.
I tried also to create new animator controller and repeated all the steps I described before. The transition work perfectly - no avatar under grond.
It seems I can’t add new states and transition for the existing animator controller. But I don’t want to reproduce my controller again( Where is the problem?

Thanks.

Check the animation in the Inspector. I’d be willing to bet that the rig for the dancing animation isn’t the same rig as your idle animation.

Medhue is probably right, your character goes into relax pose which mean that the clip doesn’t animate any property for this character. Check your clip’s rig type in the model importer inspector, you are probably not using the same rig type or both clip are generic rig and the rig is not the same.

Thanks a lot.