code: public void addContent(String destSpaceId,
                             String destContentId,
                             String fileChecksum,
                             long fileSize,
                             InputStream stream,
                             Map<String, String> properties) {
          try {
              doAddContent(destSpaceId,
                           destContentId,
                           fileChecksum,
                           fileSize,
                           getInputStream(stream),
                           properties);
          } catch (NotFoundException e) {
              throw new DuraCloudRuntimeException(e);
          }
      }
docs: This method pushes the content file to the space destSpaceId with the
  content ID destContentId
  
  @param destSpaceId   of content destination
  @param destContentId of content
  @param fileChecksum  MD5 checksum of file or null if not known
  @param stream        to add
  @param properties    user-defined properties associated with content