Is possible to play two animations in the same time?

I have two separate animations: Fire(idle) and Walk. My goal is to fire when the character is moving. Can I combine these two animations or I have to do a third animation?

You can definitely combine them. There are several ways to go about doing this, but there’s a detailed example of one option in the Montage documentation, here: LINK. The example they show is probably a little more complex than just a fire animation, but the upper body/lower body setup they use should work for you.

Good luck!