Animation not working when generic rig

Hello everyone! I'm having an issue on the animation when setting my rig to humanoid. Some of the animations play, but others don't. One example is the idle animation, where the character basically just breathes. I've seen some warning in other animations too, like: "Clip 'clip_name' has import animation warnings that might lower retargeting quality: Lower_Belly bone has translation animation that will be discarded" ... and some other bones too. When I set my rig to generic, it works fine, but I can't create Avatar Masks when generic is active. Anyone can help me with this?

 

Ok ... just found out how to make it work with Generic rig.
I had to set the model's avatar on the "Use ekelton from" option on the fbx file and then set the bones on the transform.