Pretty sure you can't do this. And UTM's only work in theory. I'm having a really hard time getting UTM's to pass through to Shopify, as Shopify's and Facebook's attribution logic conflict (or rather, just don't match up 1:1). So, let's say you run an FB conversions ad for a pair of pants. Customer A sees it on their phone, clicks on the link, and doesn't buy. Comes back two days later on their laptop and purchases a shirt. FB's standard 28-day click attribution (I change this to 7, because WTF, 28 days is way too long) will count this as a conversion. On the Shopify side, however, they don't because someone isn't doing a good job of collecting or sending cross-device behavior and resulting attribution (not sure if this is on FB or on Shopify). Now, I hope I'm wrong here and just doing something wrong on my side, but I'm having a hell of a time with this same issue (and I have a pretty good idea what I'm doing). Again, I hope to find out I'm wrong and really lame at this because all I want is more connection between my ad spend and order data. Hope that helps.
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