It is possible at some point to use certain pages made outside of WordPress, but on the same site, so that they can be rendered through their own link.
Thus, a somewhat comfortable option is to create a template page, within which to use the Include option, considering how the link relates to the path defined by WordPress.
* Template Name: Aplicatie
<?php include($_SERVER['DOCUMENT_ROOT']."/aplic/conta/index.php"); ?>
You may need that comment in the Template Name to be able to easily identify inside a page.
Also, if you want the visibility of the WordPress toolbar, you can insert, at the end, the circled row:
<?php wp_footer(); ?>. However, if the embedded page has a menu, the WordPress bar may cover it.