docs: @Override
      public StorePath uploadFile(InputStream inputStream, long fileSize,
                                  String fileExtName, Set<MetaData> metaDataSet) {
          FastFile fastFile;
          if (null == metaDataSet) {
              fastFile = new FastFile.Builder()
                      .withFile(inputStream, fileSize, fileExtName)
                      .build();
          } else {
              fastFile = new FastFile.Builder()
                      .withFile(inputStream, fileSize, fileExtName)
                      .withMetaData(metaDataSet)
                      .build();
          }
          return uploadFile(fastFile);
      }