code: public UploadResult uploadFile(String path, String fileType)
              throws APIConnectionException, APIRequestException {
          return _resourceClient.uploadFile(path, fileType);
      }
docs: Upload file, only support image file(jpg, bmp, gif, png) currently,
  file size should not larger than 8M.
  @param path Necessary, the native path of the file you want to upload
  @param fileType Current support type: image, file, voice
  @return UploadResult
  @throws APIConnectionException connect exception
  @throws APIRequestException request exception