I have installed the tag correctly under the section and the optimization script under the section in the theme.liquid file but the tag is not loaded in during checkout. I have tried pasting the script into the Settings → Checkout → Order status → additional scripts but am seeing that only apply to the Order status page (after checkout). This is on Shopify Basic plan - don’t have access to checkout files directly.
Does anyone know how to include the Google Tag Manager in the Checkout Pages in order to track conversions?