Particle system prefab not instantiated

I am trying to instantiate my fire particle system during runtime like this:

 GameObject fire, firePrefab;
 
 void Start()
 {
     ...
     firePrefab = Resources.Load("FirePrefab") as GameObject;
 }
 
 void FixedUpdate()
 {
    if (Input.GetKeyDown(KeyCode.V))
    {
        fire = Instantiate(firePrefab, transform.GetChild(3).position, transform.GetChild(3).rotation);
        Destroy(fire, 5.0f);
    }
 }

My FirePrefab is just a regular particle system, and the model the above script is attached to looks like this:

Model

Default

Camera

DroneFire

However, my fire prefab isn't instantiated anywhere when I run the game.