问REST API video.upload作为扇页，令牌无效

EN

        var mediaObject = new FacebookMediaObject
        {
            FileName = fileName,
            ContentType = "video/" + videoType
        };

        mediaObject.SetValue(videoData);

        dynamic parameters = new ExpandoObject();
        parameters.source = mediaObject;
        parameters.title = Title;
        parameters.description = Description;
        parameters.method = "video.upload";

        // Get the access token of the posting user if we need to
        if (userID != this.FacebookAccount.UserAccountId)
        {
            parameters.access_token = this.getPostingUserAuthToken(userID);
        }
        else
        {
            parameters.access_token = this.FacebookAccount.SessionKey;
        }

        dynamic publishResponse = this.FacebookConnection.Post(parameters);