loris/lib/business_logic/timeline/media.dart

class MediaAttachmentModel {
  late String type;
  late String url;
  late String previewUrl;
  late String? description;

  MediaAttachmentModel.fromJson(Map<String, dynamic> json) {
    url = json["url"];
    previewUrl = json["preview_url"];
    type = json["type"];
    description = json["description"];
  }
}