SendBigVideoModel(SendBigVideoModel)

{
    "guid": "string",
    "conversation_id": "string",
    "file_id": "string",
    "size": 0,
    "file_name": "string",
    "md5": "string",
    "video_duration": 0,
    "preview_image_url": "string",
    "preview_image_width": 0,
    "preview_image_height": 0,
    "preview_image_size": 0,
    "preview_image_md5": "string"
}