public static function maybe_add_export_files( $archive_pathname, $archive_url, $html_report_pathname, $request_id ) {

		if ( ! class_exists( 'ZipArchive' ) ) {
			return;
		}

		$request = wp_get_user_request( $request_id );
		$student = self::get_student_by_email( $request->email );

		if ( ! $student ) {
			return;
		}

		$certs = self::get_student_certificates( $student );
		if ( ! $certs ) {
			return;
		}

		$zip    = new ZipArchive();
		$delete = array();
		if ( true === $zip->open( $archive_pathname ) ) {
			foreach ( $certs as $cert ) {
				$filepath                        = llms()->certificates()->get_export( $cert->get( 'id' ), true );
				$delete[ $cert->certificate_id ] = $filepath;
				if ( is_wp_error( $filepath ) ) {
					continue;
				}
				$zip->addFile( $filepath, '/certificates/' . basename( $filepath ) );
			}
		}

		$zip->close();

		// cleanup all files
		foreach ( $delete as $id => $path ) {
			wp_delete_file( $path );
			delete_post_meta( $id, '_llms_export_filepath' );
		}

	}