When in an Email template, you cannot yet use variables passed from another action or trigger in Flow.
Topic summary
Goal: Use custom variables from a Shopify Flow trigger (beyond the Customer object) inside Shopify Email to personalize marketing emails. Screenshots show Flow outputs (Customer + custom properties) and Email’s variable picker exposing only Customer.
Current capability: A Shopify staff member states Email templates cannot yet use variables passed from another Flow action/trigger. Only standard objects exposed by Shopify Email are available. Reference provided points to Shopify Email’s Custom Liquid documentation, which does not describe accessing Flow-passed custom variables.
Requests/needs: Multiple users ask for a feature request to enable using Flow data (e.g., outputs from “Get Product Data”) directly in Marketing Emails, to populate product sections and other dynamic content.
Status: No confirmed update that this is supported. The latest reply only links to current Custom Liquid capabilities; no indication that Flow custom variables can be injected into Email templates.
Outcome: Unresolved/ongoing. Action item implicitly requested: file/track a feature request to allow Flow outputs in Shopify Email. Images are illustrative but not essential to understanding.