fix broken send to extras button

def image_from_url_text(filedata):

    if type(filedata) == dict and filedata["is_file"]:

    if type(filedata) == list and len(filedata) > 0 and type(filedata[0]) == dict and filedata[0].get("is_file", False):

        filedata = filedata[0]

    if type(filedata) == dict and filedata.get("is_file", False):

        filename = filedata["name"]

        is_in_right_dir = ui_tempdir.check_tmp_file(shared.demo, filename)

        assert is_in_right_dir, 'trying to open image file outside of allowed directories'