UnityWebRequest.GetTexture and EncodeToPNG

Hi friends!

I need to ask you about this error with the UnityWebRequest.GetTexture function.

I have a code with the WWW class to get image from Azure, then I create sprites from this images and use them in the game. And before leave the scene, I need to save some of this sprites with EncodeToPng. All my code with the WWW class works. It´s something like this:

 DownloadTexture(){
 WWW www = new WWW (url);
         yield return www;
         Texture2D tex = new Texture2D (1, 1);
         www.LoadImageIntoTexture(tex);
         Sprite image = Sprite.Create (tex, new Rect (0, 0, tex.width, tex.height), new Vector2 (0.5f, 0.5f));
 
 someGameObject.sprite = image;
 
 }
 
 SaveSprite()
 {
 byte []bytes = someGameObject.sprite.texture.EncodeToPNG ();
 }
 

I changed some variables and some stuff for simplify the case. With this code works perfect, but it´s a big data manage scene, so I tried UnityWebRequest for better performance. With the new WebRequest the performance is much better so I want to preserve this method, but When I try to save my sprites I have the error "Texture2D is not Readable" And don´t know how to change it. My new code is just a WWW to WebRequest change:

  DownloadTexture(){
 UnityWebRequest www = UnityWebRequest.GetTexture(url);
         yield return www.Send();
     tex = new Texture2D (1, 1);
     tex = ((DownloadHandlerTexture)www.downloadHandler).texture;
          Sprite image = Sprite.Create (tex, new Rect (0, 0, tex.width, tex.height), new Vector2 (0.5f, 0.5f));
  
  someGameObject.sprite = image;
  
  }
  
  SaveSprite()
  {
  byte []bytes = someGameObject.sprite.texture.EncodeToPNG ();
  }

Now I get my sprites I can play with them but can´t save them in local.

Does Anyone know how to save this in some other way or make the texture readable or something?

Thanks for your help! Have a good day!

Gabriel