[SOLVED] CI4 - Unable to Autoload Markdown Class

I am in the process of trying to use CI4 for an existing PHP program that utilises MarkDown.

In accordance with the CI4 Manual I have added the following to /app/Config/Autoload.php

PHP Code:

        /* Files available:
            Markdown.inc.php
            Markdown.php
            MarkdownExtra.inc.php
            MarkdownExtra.php
            MarkdownInerface.inc.php
            MarkdownInerface.php
        */
        $fff = '/var/www/ci2/php-markdown/Michelf/MarkdownExtra.inc.php';    
        $classmap = [
                 'Markdown' => $fff
        ];        
        // $classmap = []; // ORIGINAL SCRIPT 


Unfortunately I am unable to use CI4 way of using Markdown

I can only get it to work using require_once('Class_MarkDown.php); ...

...as can be seen in the following class:

PHP Code:

<?php 
declare(strict_types=1);

namespace App\Controllers;

use CodeIgniter\Controller;
# use App\Models\UserModel;

require_once '/var/www/ci2/php-markdown/Michelf/MarkdownExtra.inc.php';
use Michelf\Markdown, Michelf\SmartyPants;
// use Markdown, Michelf\SmartyPants;
// use Markdown, SmartyPants;
// use Markdown;

# ==========================================================
class Home extends BaseController
{

# ==========================================================
public function index()
{
  // $fff = file_get_contents(WRITEPATH .'markdown/BLURB-head.md');
  $fff  = '## Markdown test to see if H2 works OK';

  $txt = Markdown::defaultTransform($fff);
    
  $body = '<div class="tal bd4 p42">'
        .   $txt
        . '</div>'
        ;

  $data['header'] = $this->header();
  $data['body']   = $body;
  $data['footer'] = $this->footer();

    return view('v_home', $data);
}//


}///
# ==========================================================