I have placed this within the main-product.liquid file but whenever I add in my personalisation's to the text input box and add to cart, they do not show up in the cart page or within the orders page in admin

Hi,I've followed this guide on how to collect customization information for products using line item properties. https://community.shopify.com/c/Shopify-Design/Product-pages-Get-customization-information-for-products/td-p/616503  I am using the dawn ...

How can this be done on the dawn theme?