2D Animations in Unity with multiple Sprites

ok so my problem is: In Unity my 2D charakter has 3 Sprites because its Top-Down. One Side one Front one from behind. i want to animate these sprites in unity for the same charakter but i dont have the animation in multiple frames because i want do to it in unity but for only 1 character and i cant animate sprites wich are not in the scene so.... hope this is understandable