code: public void insertTimelineItem(TimelineItem item, String attachmentContentType, byte[] attachmentData) throws IOException {
  		Mirror.Timeline timeline = getMirror().timeline();
  		timeline.insert(item, new ByteArrayContent(attachmentContentType, attachmentData)).execute();
  
  	}
docs: Inserts an item with an attachment provided as a byte array.
  
  @param item
  the item to insert
  @param attachmentContentType
  the MIME type of the attachment (or null if none)
  @param attachmentData
  data for the attachment (or null if none)