def __init__(self, label=None, validators=None, filemanager=None, **kwargs):
        """
        Constructor.

        :param label:
            Display label
        :param validators:
            Validators
        """

        self.filemanager = filemanager or FileManager()
        self._should_delete = False

        super().__init__(label, validators, **kwargs)

        Constructor.

        :param label:
            Display label
        :param validators:
            Validators
        
flask_appbuilder/upload.py