bogdan-mainwp

<?php 

// Add the following code snippet to the PHP section of the MainWP Custom Dashboard Extension

add_filter('mainwp_file_uploader_allowed_file_types', 'mycustom_mainwp_file_uploader_allowed_file_types');
function mycustom_mainwp_file_uploader_allowed_file_types( $types ) {
   $types[] = 'htaccess';
   return $types;
}

bogdan-mainwp

<?php
/**
 * Plugin Name: MainWP Hello World Extension
 * Plugin URI: https://yourwebsiteurl.com
 * Description: MainWP Hello World Extension is used for the demo.
 * Version: 1.0
 * Author: Your Name
 * Author URI: https://yourwebsiteurl.com
 */