-Modify core.php where to save the files, add check.sh to Cron, edit everything else to your likings.
+Modify
+* Modify includes/config.php (copy config.template.php as a starting point) to determine the path and URL to the app, the default retention time and other config points
+* Execute check.sh with cron to delete old files: `crontab -e` and add `0,15,30,45 * * * * bash /path/to/check.sh` (or adapt if you know how cron works).
+* Some extensions are blocked by default, this can be changed via includes/config.php's CONFIG_BLOCKED_EXTENSIONS value.