[Solved] Scroll not working when elements inside have click events

I found what was happening! The point is that if you use Event Trigger it will eat all other inputs because it implements all the EventSystem interfaces (and the OnDrag event used by the scroll rect was eclipsed).

  namespace UnityEngine.EventSystems
  {
      [AddComponentMenu("Event/Event Trigger")]
      public class EventTrigger : MonoBehaviour, IEventSystemHandler, IPointerEnterHandler, IPointerExitHandler, IPointerDownHandler, IPointerUpHandler, IPointerClickHandler, IDragHandler, IDropHandler, IScrollHandler, IUpdateSelectedHandler, ISelectHandler, IDeselectHandler, IMoveHandler
      {
          [Serializable]
          public class TriggerEvent : UnityEvent<BaseEventData>
          {
          }
  ... blah, blah, blah
 }
 }

So, the solution, avoid using Event Trigger, instead, implement the interface you need for the purpose. My example, instead of adding OnPointerDown and OnPointerUp using the Event Trigger I added this script to the object:

 using UnityEngine;
 using System.Collections;
 using UnityEngine.EventSystems;
 
 public class Click : MonoBehaviour, IPointerDownHandler, IPointerUpHandler {
 
     public void OnPointerDown (PointerEventData eventData) {
         // Do action
     }
 
     public void OnPointerUp (PointerEventData eventData) {
         // Do action
     }
 }
 

When I try this implementation:

 public class Click : MonoBehaviour, IPointerDownHandler, IPointerUpHandler {

  public void OnPointerDown (PointerEventData eventData) {
      // Do action
  }
 
  public void OnPointerUp (PointerEventData eventData) {
      // Do action
  }

}

On mobile device OnPointerUp event is triggered almost same time as OnPointerDown, so can't do anything with this implementation, am I doing something wrong?

A simpler solution is to just use a button. I deleted the EventTrigger components and replaced them with simple Button components and this allowed the Image component to remain clickable and propagated the scroll event up to the ScrollRect game object, so the scrolling action now works when users scroll over the image.