How to change the movie texture on a raw image depending on what button is clicked

I have a raw image which has a movie texture on it, and I have several buttons. I'm trying to make it so that every time a different button is clicked the corresponding movie texture is played.

I made a video controller, that I have attached to each button and chosen a different video for each button, but currently only the texture that was originally on the raw image plays but the texture doesn't change when I press any other button.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class VideoController : MonoBehaviour
 {
    
     public MovieTexture video;
     
 
 
     public void OnMouseDown()
     {
         GetComponent<Renderer>().material.mainTexture = video as MovieTexture;
 
         if (!video.isPlaying)
         {
 
             video.Stop();
 
         }
         
             video.Play();
         
         
     }
 
 
     
     void Update()
     {
 
         
     }
 }