i created desktop application that upload videos to facebook using graph.facebook and it works ok, but when i try to add "thumb" field to upload request it return error "(OAuthException - #100) (#100) Invalid image format. It should be an image file data." . here my code used :note coverpath is full image path and i try to path image as bytes but the same error return.dynamic parameters = new ExpandoObject();
parameters.source = new FacebookMediaObject
{
ContentType = string.Format("video/{0}", VideoExtension.Split('.')[1]),
FileName = VideoName
} .SetValue(File.ReadAllBytes(filePath));
parameters.title = VideoTitle;
parameters.description = VideoTitle;
parameters.universal_video_id = new Guid();
parameters.thumb = coverPath;
parameters.published = false;
parameters.unpublished_content_type = "DRAFT";
dynamic uploadresult = fb.Post("/367728493684998/videos", parameters);