code: public BoxRequestsFile.GetUploadSession getUploadSession(String uploadSessionId) {
          return new BoxRequestsFile.GetUploadSession(uploadSessionId, getUploadSessionInfoUrl(uploadSessionId), mSession);
      }
docs: Gets a request to fetch the upload session using the upload session id. It contains the number of parts that are processed so far,
  the total number of parts required for the commit and expiration date and time of the upload session.
  @return the status.