Enqeue files from Code Snippet

Hi Snippets

I have some code that enqeues external php and css files to load. I had it in a child theme, but since I then loose the theme design, I prefer to move back to TT5, add the enqeues in code snipppets and then enqeue external files. I am using:

require_once get_stylesheet_directory() . ‘/file-path/external-functions.php’;

This does not seem to load and I remember that this hook is specifically for a child theme?! Do you know which one to use?

But first of all, do you see any issues with such a construction?

Code Snippet – functions enqeue
External files – custom folder inside TT5 structure

Any advice on this is most appreciated.

Thx