Setup automated follow-up email on purchase of products from specific collection

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I do not see “Product of Specific Collection” exists under “add condition” step… has anybody been successful with these instructions? I’m trying to send a thank you and the actual product is in a Google Drive document, and after purchase of said product, I want the customer to receive this email. I CANNOT figure it out. Shopify is actually really difficult for someone that just needs simple steps…