[Unity] Rotate object with touch operation

I tried to execute it with reference to the above article on which tamachan2020 was posted, but it worked, so I will describe the possible cause.

Cannot run on Unity editor (Windows, Mac)
As described below, Input.Touches will not work unless it is built for iPhone or Android and it is run on a real machine
How to debug Input.Touches in the editor
I think you should change the method according to your purpose
・ I want to build and run it on a real machine → Build it every time and check the operation, or use the following code that works on both the editor and the real machine
Implement common iOS/Android/Editor touch processing in Unity
・ It is not necessary to run on iPhone or Android, it should work on Windows and Mac → Use Input.GetMouseButton and Input.GetMouseButtonDown methods

Building for iPhone or Android and running it on a real machine, but doesn't work
There is a possibility that setup has failed, check if there is an error in red from Windows>General>Console of Unity Editor, or paste a screenshot of what you did at the following site If you can, I will investigate again.
[Unity] Touch object to rotate object

Let's solve one by one until you can check if Update is working

1 Place a Cube
>I don't see any wooden squares like the ones currently on the net

This is right-click in Hierarchy view and select 3D Object>Cube to place the Cube, it is not a wooden square like the site but it is enough to check the operation

Create a TouchController script similar to 2 sites

Write the site code in the created TouchController.cs

* It does not work unless the name of the created script and the class name of the described code are TouchController

Attach the 3 TouchController component to an empty game object

You can drag and drop TouchController.cs from the Project view into the Inspector view, but this time we are attaching from the Add Component in the Inspector view

If there is something you can't do so far, you can recreate a new Unity project and start over from scratch

4 How to check if the script update is working
>Because it doesn't stop at the beginning of update in script
Although tamachan2020 has been confirmed to work with breakpoints, it is possible that the debugging method does not match and is not working, so let's debug this time with a code base.
Change the code of TouchController.cs as follows and check whether the log is displayed in the Console view.

using UnityEngine;
using System.Linq;
public class TouchController: MonoBehaviour
{
    ///
Rotation target
    public GameObject Cube;
    ///
Rotation speed
    public float Speed ​​= 0.01f;
    void Update ()
    {// Touch count acquisition (Linq was used)
        int touchCount = Input.touches
            .Count (t =>t.phase! = TouchPhase.Ended&&t.phase! = TouchPhase.Canceled);
        // Display the number of touches in the log that can be checked from Windows>General>Console of the processing that was added for debugging, Unity editor
        Debug.Log ($"Number of touches: {touchCount}");
        if (touchCount == 1)
        {
            Touch t = Input.touches.First ();
            switch (t.phase)
            {
                case TouchPhase.Moved:
                    // Angle calculation according to the amount of movement
                    float xAngle = t.deltaPosition.y * Speed ​​* 10;
                    float yAngle = -t.deltaPosition.x * Speed ​​* 10;
                    float zAngle = 0;
                    //rotation
                    Cube.transform.Rotate (xAngle, yAngle, zAngle, Space.World);
                    break;
            }
        }
    }
}