docs: def can_import(self, file_uris, current_doc=None):
          """
          Check that the specified file looks like a directory containing many
          pdf files
          """
          if len(file_uris) <= 0:
              return False
          try:
              for file_uri in file_uris:
                  file_uri = self.fs.safe(file_uri)
                  for child in self.fs.recurse(file_uri):
                      if self.check_file_type(child):
                          return True
          except GLib.GError:
              pass
          return False