using APPPATH

There are at least 4 Global directories in CI4  which are WRITEPATH,FILEPATH,ROOTPATH and APPPATH so for you to get your assets you shoul use ROOTPATH  https://codeigniter.com/user_guide/gener...l#ROOTPATH

APPPATH indicates inside APP and ROOTPATH The path to the project root directory


also, these files can be registered to autoload if you like

PHP Code:

<?php

namespace Config;

use CodeIgniter\Config\AutoloadConfig;

class Autoload extends AutoloadConfig
{
    // ...
    public $classmap = [
        ///inside APP
        'Markdown' => APPPATH . 'ThirdParty/markdown.php',
    //in the root directory    app,Myfiles
       'Markdown' => ROOTPATH . 'Myfiles/MyExecutive_summary.php.php',
    ];

    // ... 


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