Attack Animation not working

Hi

I recently got into creating games in Unity and decided to start off with a small 2D game

I used this Unity tutorial to help with the sprite animations and it all worked until I attempted to add in my attack animation in the code and animation and animator tabs but it did not work. Here is my code and where the ** is on either side is the code I have added to attempt to make this attack animation:

 using UnityEngine;
 using System.Collections;
 
 public class PlayerController : MonoBehaviour {
 
     public float maxSpeed = 10f;
     bool facingRight = true;
 
     Animator anim;
 
     **public bool attack = false;**
     bool grounded = false;
     public Transform groundCheck;
     float groundRadius = 0.2f;
     public LayerMask isGround;
     public float jumpForce = 700f;
 
     void Start () {
 
         anim = GetComponent<Animator> ();
     
     }
 
     void FixedUpdate () {
 
         grounded = Physics2D.OverlapCircle (groundCheck.position, groundRadius, isGround);
         anim.SetBool ("Ground", grounded);
 
 
         anim.SetFloat ("vSpeed", GetComponent<Rigidbody2D>().velocity.y);
 
         float move = Input.GetAxis ("Horizontal");
 
         anim.SetFloat ("speed", Mathf.Abs (move));
 
         GetComponent<Rigidbody2D>().velocity = new Vector2(move * maxSpeed,  GetComponent<Rigidbody2D>().velocity.y);
 
         if (move > 0 && !facingRight)
             Flip ();
         else if (move < 0 && facingRight)
             Flip ();
 }
 
     void Update(){
 
 
         if (grounded && Input.GetKeyDown (KeyCode.Space)) {
             anim.SetBool("Ground", false);
             GetComponent<Rigidbody2D>().AddForce(new Vector2(0,jumpForce));
 
         **if (grounded && Input.GetKeyDown(KeyCode.C)){**
                 **anim.SetBool("Attack", true);**
                 **attack = true;**
             }
         }
     }
 
     void Flip(){
         facingRight = !facingRight;
         Vector3 theScale = transform.localScale;
         theScale.x *= -1;
         transform.localScale = theScale;
     }
 
 }

I then created the transitions in the animator between the states such as if going from the idle animation state if attack = true then run the attack animation. If you need any more info I can provide it

Thank you very much!