code: @Override
      public String upload(InputStream in, UploadMetaData metaData) throws FlickrException {
          Payload payload = new Payload(in);
          return sendUploadRequest(metaData, payload);
      }
docs: Upload a photo from an InputStream.
  
  @param in
  @param metaData
  @return photoId or ticketId
  @throws FlickrException