Video How to get texture from a recorded video so that it can be shown on a custom gallery?

I am recording a video using a screen recording plugin replay kit. So after recording the video I want to create an image for the video gallery by taking a screenshot of the video while playing. I tried the following code but failed. I have added a video player on the heirarchy and dragged a dropped a Render texture created on the project window.

Code (CSharp):

1.  
2. [SerializeField] private VideoPlayer videoPlayer;
3.  protected override void OnEnable()
4.     {
5.         videoPlayer.prepareCompleted += PrepareComplete;
6.     }
7.  
8. private void CopyVideoScreenshot(string sourceVideoPath)
9.     {
10.         Debug.Log("Source path == "+sourceVideoPath);
11.        // string path = "file://" + sourceVideoPath;
12.         videoPlayer.source = VideoSource.Url;
13.         videoPlayer.url = sourceVideoPath;
14.         videoPlayer.Prepare();    
15.         //videoPlayer.Play();
16.         Debug.Log("Video Playing");
17.     }
18.  
19.  private void PrepareComplete(VideoPlayer videoplayer)
20.     {
21.         Debug.Log("Prepare Video");
22.         RenderTexture renderTexture = videoPlayer.targetTexture;
23.         int width = videoPlayer.texture.width;
24.         int height = videoPlayer.texture.height;
25.         Texture2D texture= new Texture2D(width, height, TextureFormat.RGBA32, false);
26.         if (texture.width != renderTexture.width || texture.height != renderTexture.height)
27.         {
28.             texture.Resize(renderTexture.width, renderTexture.height);
29.         }
30.         //RenderTexture.active = renderTexture;
31.         texture.ReadPixels(new Rect(0, 0, renderTexture.width, renderTexture.height), 0, 0);
32.         texture.Apply();
33.         Debug.Log("Texture Name ="+texture.name);
34.         //RenderTexture.active = null;
35.  
36.       //Save on persistent data path
37.    }
38.  protected override void OnDisable()
39.     {
40.         videoPlayer.prepareCompleted -= PrepareComplete;  
41.     }
42.    

For some reason, the PrepareComplete() method is not getting called in Android(version 10 and Unity 2019.4.17f1).
How is prepareCompleted event called?While videoPlayer.Play() or videoPlayer.Prepare()