Markdown View

How to properly use Markdown in Phalcon. I found this code;

$di->set('view', function() {
    $view = new \Phalcon\Mvc\View();
    $view->setViewsDir('../app/views/');
    $view->registerEngines([
        '.md' => function($view, $di) {
            $md = new \Phalcon\Mvc\View\Engine\Markdown($view, $di);
            $md->setOptions([
                'compiledPath' => '../app/compiled-templates/',
                'compiledSeparator' => '_',
                'renderFlags' => [ 'special-attribute', 'line-continue' ],
            ]);
            return $md;
        }
    ]);
    return $view;
});

Source: https://hiden.samurai-factory.jp/php/phalcon_markdown/

This is the code I'm using:

use Phalcon\Mvc\View,
Phalcon\Mvc\View\Engine\Volt,
Phalcon\Mvc\View\Engine\Markdown;

$di->set('view', function() use ($config) {

        $view = new View();

        $view->setViewsDir($config->phalcon->views);

        $view->registerEngines(array(

            '.phtml' => function($view, $di) use ($config) {

                $volt = new Volt($view, $di);

                $volt->setOptions([
                    'compiledPath' => $config->phalcon->cache,
                    'compiledExtension' => '.compiled',
                    'compileAlways' => true,
                    'stat' => true
                ]);

                return $volt;
            },

            '.md' => function($view, $di) use ($config) {

                $md = new Markdown($view, $di);

                $md->setOptions([
                    'compiledPath' => $config->phalcon->cache,
                    'compiledSeparator' => '_',
                    'renderFlags' => [ 'special-attribute', 'line-continue' ],
                ]);
                return $md;
            }

        ));

        return $view;
    });

But all I see is blank page. Even my old phtml files that use volt don't work now. Is Markdown adapter comes with Phalcon or it needs to be compiled and included seperately ? Note that I would like to use both Volt and Markdown views. Thanks.