Animation play not working C#

Hello everyone, I'm new to Unity and my animation does not run even though it returns "true", I have a looping animation "idle" it works however the 'shoot' animation does not work.

 void Update () 
     {
        
         if (Input.GetButtonDown("Fire1"))
         {    
             
            Rigidbody bullet = Instantiate(myBulletPrefab, transform.position, transform.rotation) as  Rigidbody;
             
               bullet.velocity = transform.TransformDirection(new Vector3 (0,0,shootForce));
             Animation anim = gun.GetComponent<Animation>();
            // AnimationClip clipshoot = anim.GetClip("shoot");
             anim.Play("shoot");
          }
 }