public static function replace_files_from_to($fs, $contextid, $sourceitemid, $itemid, $area, $includesubdirs = false) {
        $component = 'assignfeedback_editpdf';
        // Remove the existing files within this area.
        $fs->delete_area_files($contextid, $component, $area, $itemid);

        // Copy the files from the source area.
        if ($files = $fs->get_area_files($contextid, $component, $area, $sourceitemid,
                                         "filename", $includesubdirs)) {
            foreach ($files as $file) {
                $newrecord = new \stdClass();
                $newrecord->contextid = $contextid;
                $newrecord->itemid = $itemid;
                $fs->create_file_from_storedfile($newrecord, $file);
            }
        }
    }