OnMouseDown и д.р не работают Unity

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class InventorySlot : MonoBehaviour
{
    public ItemsInventory.Item item;

    public Image image;

    public InventoryManager inventoryManager;
    public UIControl uiControl;

    private void Awake()
    {
        inventoryManager = GameObject.FindObjectOfType<InventoryManager>().gameObject.GetComponent<InventoryManager>();
        uiControl = GameObject.FindObjectOfType<UIControl>().gameObject.GetComponent<UIControl>();
    }

    public void UpdateItem()
    {
        if(item != null)
        {
            image.sprite = item.spriteItem;
        }
        else
        {
            image.sprite = null;
        }
    }

    private void OnMouseEnter()
    {
        Debug.Log("E");
        if(item != null) inventoryManager.ItemNameDesc(item.nameItem, item.descriptionItem);
    }

    private void OnMouseExit()
    {
        inventoryManager.ItemNameDesc("", "");
    }

    

    private void OnMouseOver()
    {
        if (Input.GetMouseButtonDown(0))
        {
            if (item != null)
            {
                item.Use(uiControl);
                item = null;
                UpdateItem();
            }
        }
        if(Input.GetMouseButtonDown(1))
        {
            if (inventoryManager.itemInHand != null)
            {
                item = inventoryManager.itemInHand;
                inventoryManager.itemInHand = null;
                UpdateItem();
            }
            else if (inventoryManager.itemInHand == null)
            {
                inventoryManager.itemInHand = item;
                item = null;
                UpdateItem();
            }
        }
    }
}