Canvas Win/Lose but not display

Assets/Scripts/WinCanvas.cs

@@ -0,0 +1,22 @@
+using UnityEngine;
+using UnityEngine.SceneManagement;
+
+public class WinCanvas : MonoBehaviour
+{
+    // Start is called once before the first execution of Update after the MonoBehaviour is created
+    void Start()
+    {
+        
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+        
+    }
+
+    public void NextLevel()
+    {
+        SceneManager.LoadSceneAsync(SceneManager.GetActiveScene().buildIndex + 1);
+    }
+}