Google Spreadsheet cannot find my .gs Functions

I have perfectly replicated the starter google tutorial:

as well as many others and my functions and scripts never appear in the Add-on. Typing =anyFunction() will simply give me a 'function unknown' error.

I have also tried resetting my cache.

Why are my .gs files not connecting with my spreadsheet if I have reproduced the steps in this tutorial?

Attention: If you downvoted this question because you don't understand what I'm asking, you probably shouldnt be answering questions about google spreadsheet. Just a hint, google spreadsheets usually connect to their Script counterparts. Look at the link I sent you for reproduction steps.