Gupshup聊天机器人通过whatsapp频道上传图片失败

Question

我正在使用

var image = {"type":"image","originalUrl":"image url here","previewUrl":"thumbnail url here"};
    context.sendResponse(JSON.stringify(image));

用于将图像上传到gupshup whatsapp聊天机器人的格式，但是图像尚未发送， 显示的错误是

{
  "meta": {
    "api_status": "stable",
    "version": "2.21.4"
  },
  "errors": [
    {
      "code": 1014,
      "title": "Internal error",
      "details": "Image file format (application/octet-stream) is not supported"
    }
  ]
}