docs: def add(self, filetype, **kwargs):
          """ Adds a filepath into the list of tasks to download"""
  
          location = self.location(filetype, **kwargs)
          source = self.url(filetype, sasdir='sas' if not self.public else '', **kwargs)
          if 'full' not in kwargs:
              destination = self.full(filetype, **kwargs)
          else:
              destination = kwargs.get('full')
  
          if location and source and destination:
              self.initial_stream.append_task(location=location, source=source, destination=destination)
          else:
              print("There is no file with filetype=%r to access in the tree module loaded" % filetype)