Get multiple images from online server and download them to android app

Hi, i a working on a sort of app where you can text and upload images to a main page. i have a problem where i can upload an multiple images to [my server][1] and then retrieve all of them and display the images on a scroll or something like that. i also don't want the app to like instantly freeze when it tries t download them. Here is my scripts,

image downloader

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class imagefinder : MonoBehaviour
 {
     public Image imageToDisplay;
     string url = "---stripped for security reasons---";
 
     void Start()
     {
         StartCoroutine(loadSpriteImageFromUrl(url));
     }
 
     IEnumerator loadSpriteImageFromUrl(string URL)
     {
 
         WWW www = new WWW(URL);
         while (!www.isDone)
         {
             Debug.Log("Download image on progress" + www.progress);
             yield return null;
         }
 
         if (!string.IsNullOrEmpty(www.error))
         {
             Debug.Log("Download failed");
         }
         else
         {
             Debug.Log("Download succes");
             Texture2D texture = new Texture2D(1, 1);
             www.LoadImageIntoTexture(texture);
 
             Sprite sprite = Sprite.Create(texture,
                 new Rect(0, 0, texture.width, texture.height), Vector2.zero);
 
             imageToDisplay.sprite = sprite;
         }
     }
 }
 

this is the two controller scripts

 using UnityEngine;
 using System.Collections;
 using UnityEngine.Events;
 
 public enum ImageType
 {
     PNG,
     JPG
 }
 
 public class ImageUploader : MonoBehaviour
 {
     Texture2D imageTexture;
     string fieldName;
     string fileName = "myimage";
     ImageType imageType = ImageType.PNG;
     string url;
 
     //Events
     UnityAction<string> OnErrorAction;
     UnityAction<string> OnCompleteAction;
 
 
     public static ImageUploader Initialize ()
     {
         return new GameObject ("ImageUploader").AddComponent <ImageUploader> ();
     }
 
     public ImageUploader SetUrl (string serverUrl)
     {
         this.url = serverUrl;
         return this;
     }
 
     public ImageUploader SetTexture (Texture2D texture)
     {
         this.imageTexture = texture;
         return this;
     }
 
     public ImageUploader SetFileName (string filename)
     {
         this.fileName = filename;
         return this;
     }
 
     public ImageUploader SetFieldName (string fieldName)
     {
         this.fieldName = fieldName;
         return this;
     }
 
     public ImageUploader SetType (ImageType type)
     {
         this.imageType = type;
         return this;
     }
     //events
     public ImageUploader OnError (UnityAction<string> action)
     {
         this.OnErrorAction = action;
         return this;
     }
 
     public ImageUploader OnComplete (UnityAction<string> action)
     {
         this.OnCompleteAction = action;
         return this;
     }
 
     public void Upload ()
     {
         //check/validate fields
         if (url == null)
             Debug.LogError ("Url is not assigned, use SetUrl( url ) to set it. ");
         //...other checks...
         //...
 
         StopAllCoroutines ();
         StartCoroutine (StartUploading ());
     }
 
 
 
     IEnumerator StartUploading ()
     {
         WWWForm form = new WWWForm ();
         byte[] textureBytes = null;
 
         //Get a copy of the texture, because we can't access original texure data directly. 
         Texture2D imageTexture_copy = GetTextureCopy (imageTexture);
 
         switch (imageType) {
             case ImageType.PNG:
                 textureBytes = imageTexture_copy.EncodeToPNG ();
                 break;
             case ImageType.JPG:
                 textureBytes = imageTexture_copy.EncodeToJPG ();
                 break;
         }
 
         //image file extension
         string extension = imageType.ToString ().ToLower ();
 
         form.AddBinaryData (fieldName, textureBytes, fileName + "." + extension, "image/" + extension);
 
         WWW w = new WWW (url, form);
 
         yield return w;
 
         if (w.error != null) {
             //error : 
             if (OnErrorAction != null)
                 OnErrorAction (w.error); //or OnErrorAction.Invoke (w.error);
         } else {
             //success
             if (OnCompleteAction != null)
                 OnCompleteAction (w.text); //or OnCompleteAction.Invoke (w.error);
         }
         w.Dispose ();
         Destroy (this.gameObject);
     }
 
     Texture2D GetTextureCopy (Texture2D source)
     {
         //Create a RenderTexture
         RenderTexture rt = RenderTexture.GetTemporary (
                                source.width,
                                source.height,
                                0,
                                RenderTextureFormat.Default,
                                RenderTextureReadWrite.Linear
                            );
 
         //Copy source texture to the new render (RenderTexture) 
         Graphics.Blit (source, rt);
 
         //Store the active RenderTexture & activate new created one (rt)
         RenderTexture previous = RenderTexture.active;
         RenderTexture.active = rt;
 
         //Create new Texture2D and fill its pixels from rt and apply changes.
         Texture2D readableTexture = new Texture2D (source.width, source.height);
         readableTexture.ReadPixels (new Rect (0, 0, rt.width, rt.height), 0, 0);
         readableTexture.Apply ();
 
         //activate the (previous) RenderTexture and release texture created with (GetTemporary( ) ..)
         RenderTexture.active = previous;
         RenderTexture.ReleaseTemporary (rt);
 
         return readableTexture;
     }
 }

and this is the second one

 using UnityEngine;
 
 public class Test : MonoBehaviour
 {
     [SerializeField] SpriteRenderer imageSprite;
     
     [SerializeField] string serverUrl;
 
     public void StartUploade ()
     {
         ImageUploader
             .Initialize ()
             .SetUrl (serverUrl)
             .SetTexture (imageSprite.sprite.texture)
             .SetFieldName ("myimage")
             .SetFileName ("myimage")
             .SetType (ImageType.JPG)
             .OnError (error => Debug.Log (error))
             .OnComplete (text => Debug.Log (text))
             .Upload ();
         
         ImageUploader
             .Initialize ()
             .SetUrl (serverUrl)
             .SetFieldName ("myimage")
             .Upload ();
     }
 }

thx