code: public Upload resumeUpload(PersistableUpload persistableUpload) {
          assertParameterNotNull(persistableUpload,
                  "PauseUpload is mandatory to resume a upload.");
          configuration.setMinimumUploadPartSize(persistableUpload.getPartSize());
          configuration.setMultipartUploadThreshold(persistableUpload
                  .getMutlipartUploadThreshold());
          return doUpload(new PutObjectRequest(persistableUpload.getBucketName(),
                  persistableUpload.getKey(), new File(persistableUpload.getFile())), null, null,
                  persistableUpload);
      }
docs: Resumes an upload operation. This upload operation uses the same
  configuration {@link TransferManagerConfiguration} as the original
  upload. Any data already uploaded will be skipped, and only the remaining
  will be uploaded to Amazon S3.
  
  @param persistableUpload
  the upload to resume.
  @return A new <code>Upload</code> object to use to check the state of the
  upload, listen for progress notifications, and otherwise manage
  the upload.
  
  @throws AmazonClientException
  If any errors are encountered in the client while making the
  request or handling the response.
  @throws AmazonServiceException
  If any errors occurred in Amazon S3 while processing the
  request.