Touch - drag different objects

Hi, I'm trying to make draggable objects on the Stage for Android and iOS, looking in the forum I found this script but it doesn't work, have any suggestions?

The most problematic thing is to isolated the touch event on a specific game object.

This script is attacched to every draggable object on the stage:

 #if UNITY_ANDROID
     
     void Update () {
 
         foreach (Touch touch in Input.touches){
 
             Ray ray = Camera.main.ScreenPointToRay(touch.position);
             RaycastHit hit = new RaycastHit();
         
             if (Physics.Raycast(ray, out hit, 100f)) {
                 
                 //Debug.Log (hit.collider.transform.position);
                 
                 if(touch.phase == TouchPhase.Began){
                     var cameraTransform = Camera.main.transform.InverseTransformPoint(0, 0, 0);
                     transform.position = Camera.main.ScreenToWorldPoint(new Vector3 (touch.position.x, touch.position.y, cameraTransform.z - 0.5f));
                     //objectSelected();
                 }
                 
                 if(touch.phase == TouchPhase.Moved){
                     if (hit.collider.gameObject == this.gameObject) {
                         var cameraTransform = Camera.main.transform.InverseTransformPoint(0, 0, 0);
                         transform.position = Camera.main.ScreenToWorldPoint(new Vector3 (touch.position.x, touch.position.y, cameraTransform.z - 0.5f));
                         //objectDragged();
                     }
                 }
                 
                 if(touch.phase == TouchPhase.Ended){
                     //objectDeselected();
                 }
 
             }
         }
 
      }
 #endif