CSHARP

unity download image from online

void Start(){    
    StartCoroutine(DownloadImage(url));
}

IEnumerator DownloadImage(string MediaUrl)
{   
    UnityWebRequest request = UnityWebRequestTexture.GetTexture(MediaUrl);
    yield return request.SendWebRequest();
    if(request.isNetworkError || request.isHttpError) 
        Debug.Log(request.error);
    else
        YourRawImage.texture = ((DownloadHandlerTexture) request.downloadHandler).texture;
}