Animation in blender don't work on model (rigged from Mixamo)

Hello,

1. I made a model in blender.
2. Rigged it with mixamo.com.
3. Add some animations with my model (run, idle etc.).
4. Imported my model as "Human@Idle" on my unity project and every animations works fine.

But now I want to make a custom animation on blender.

1. Imported "Human@Idle" inside blender (so rigged with mixamo).
2. Made another animation "Human@Jump" with the same rig as mixamo gave to me.
3. Importing now "Human@Jump" to unity.
4. Trying to add this animation to my animator (preview is working).

But when I import "Human@Jump" , I can't add this animation to my previous "Human@Idle" animator.
However, animation works fine on my preview. So the animation is working when I use the model directly.

"Human@Jump" can only play animation "Jump".
"Human@Idle" c'ant play Jump but can play every other animations from mixamo.

How to add a custom blender animation to a model rigged with mixamo ? I understand now that it will be better to do all animations in blender or with mixamo, and mixing together are difficult... Will do for my next model.