Thanks for posting about this!
To clarify, did you follow the steps in this tutorial? If so, I recommend posting in that Community thread to ask for more help with this, as the users currently involved in that topic can likely help out with the situation you're experiencing.
However, it's also important to note that this is an advanced coding tutorial that is not supported by Shopify, but Shopify Experts may be able to help you further with this. Experts are third-party designers and developers who are very skilled in adding customizations to Shopify themes, so they'd be a great resource to speak to about this further. You can contact them via this website.
Please let me know if you have any other questions or concerns!
I wanted to check in with you to find out if you were able to get the help you needed with your above question?
I'm here to lend a hand if you need any more help!