Install the Matomo tracking code on my Shopify

Hello,

I was following the instruction how to Install the Matomo tracking code on my Shopify. https://matomo.org/faq/new-to-piwik/how-do-i-install-the-matomo-tracking-code-on-my-shopify-store/

I have an issue with point 8.

Click on the cart-template.liquid file in the left navigation menu under the “Sections” folder to open it

I am missing cart-template.liquid under Sections in shopify,

How I should proceed in this case?