Unity rawimage background seamlessly connected mobile

1. First create UI RawImage
2. Picture settings

3. effect

4. Code

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
public class FilmMove : MonoBehaviour
{
    // Speed 
    public float m_speedmove;
 
    private RawImage m_RawImage;
    // Use this for initialization
    void Start () {
        m_RawImage = this.GetComponent<RawImage>();
       
    }
	
    // Update is called once per frame
    void Update () {
        float s =this.m_speedmove * Time.deltaTime;
        Rect r =this.m_RawImage.uvRect;
        // change x or y, To change the moving direction of the picture 
        r.y += s;
        this.m_RawImage.uvRect = r;
    }
    // Up and down alternately to achieve seamless connection 
    // public float m_MoveSpeed = 1;
    // // Start is called before the first frame update
    // void Start()
    // {
    //     
    // }
    //
    // // Update is called once per frame
    // void Update()
    // {
    //     transform.Translate(0,m_MoveSpeed*Time.deltaTime*100,0);
    //     if (transform.position.y >= 2880)
    //     {
    //         transform.localPosition=new Vector3(0,-1915,0);
    //     }
    // }
}