def show_file_explorer(self):
popup = Popup(size_hint=(0.8, 0.8))
file_explorer = FileChooserListView(
filters=['*.jpg', '*.png', '*.jpeg'])
file_explorer.bind(on_submit=self.show_add_slide)
file_explorer.popup = popup
popup.content = file_explorer
popup.title = _('File explorer')
popup.open()
