code: function(id) {
              if (handler.getProxy && handler.getProxy(id)) {
                  return handler.getProxy(id).referenceBlob;
              }
  
              return handler.getFile && handler.getFile(id);
          }
docs: Returns a File, Blob, or the Blob/File for the reference/parent file if the targeted blob is a proxy. Undefined if no file record is available.