Facebook Unity API - 发布带有链接和描述的屏幕截图？

我正在尝试让我的应用程序（iOS、Android）允许用户将屏幕截图发布到 Facebook，并附上链接和描述。我可以使用 FB.API() 将我的应用程序的屏幕截图上传到 Facebook 为我的应用程序自动生成的用户相册，方法是：

    int width = Screen.width;
    int height = Screen.height;
    Texture2D tex = new Texture2D(width, height, TextureFormat.RGB24, false);

    // Read screen contents into the texture
    tex.ReadPixels(new Rect(0, 0, width, height), 0, 0);

    tex.Apply();
    byte[] screenshot = tex.EncodeToPNG();

    var wwwForm = new WWWForm();

    string picName = "Idioman_" + Time.time + ".png";
    wwwForm.AddBinaryData("image", screenshot, picName);

    Debug.Log("trying to post screenshot");
    FB.API("me/photos", Facebook.HttpMethod.POST, PostPicCallback, wwwForm); 

我可以使用 FB.Feed() 从互联网上发布图像，并附上用户提要的链接和描述。有没有办法将屏幕截图发布到用户的提要中，并附上链接和描述？

    var snap = new Texture2D(Screen.width, Screen.height, TextureFormat.RGB24, false);
    snap.ReadPixels(new Rect(0, 0, Screen.width, Screen.height), 0, 0);
    snap.Apply();
    var screenshot = snap.EncodeToPNG();

    int i = UnityEngine.Random.Range (0, 2);

    var wwwForm = new WWWForm();
    wwwForm.AddBinaryData("image", screenshot, "picture.png");
    wwwForm.AddField ("name", "this will be the caption for the image");

    FB.API("me/photos", HttpMethod.POST, CallbackUploadImage, wwwForm);

您可以参考此处了解可用字段的更多详细信息

https://developers.facebook.com/docs/graph-api/reference/v2.2/photo https://developers.facebook.com/docs/graph-api/reference/v2.2/photo