Problems importing a blender "rig" animated model.

Good evening to everyone! I'm with a noob problem, i supose, and i'd appreciate your help. So, When i export my Blender model to Unity 3D, that's alright, he appears, and apparently, the three animations i've made (opening arms; opening legs; and breathing) are there. I used the "metarig" to make the model opening the arms, and opening the legs, and they happen when i press play on the preview window, but in the animation of the breath i used the "rig", not the "metarig". So, the animation that i've used the rig on Blender, don't happen in Unity (even the blue spot moving like if was playing the animation). I would like to know if you already get through that problem, and if affirmative, how to solve? Could you help me? Really thanks! (Unfortunately, i don't have a video to show, but the issue is: the arms and legs, using "metarig" works after press the play button, but the breath, who i used "rig" instead of "metarig", it's freezed).
.