If you are using a catalogue ad that pulls a dynamic website URL from your catalogue in your Commerce manager, you will not be able to add the UTMs directly to the Website URLs the way you can on a "Single Image/Video ad", so you need to add the UTM parameters to the 'URL Parameters' box in the Tracking section at the bottom of the ad:

When your Shopify Products are automatically synced with FB, the website URLs are updated inside FB to include UTM codes in utm_source=facebook so you do not need to include utm_source={{site_source_name}}.

FB also automatically includes a parameter for utm_content, so you cannot use utm_content={{ad.id}} in the URL parameters section at the bottom of the ad. You must instead use utm_medium={{ad.id}}, utm_campaign={{ad.id}}, utm_term={{ad.id}}, or ref={{ad.id}}.

Finally you can publish the ad, and you will be tracking with Cometly!

For any remaining ads that do not use dynamic creative, return to the main article How to ensure your UTMs are set up perfectly.