When you edit a template in Wishlist Flow's Mail Designer, what happens next depends on the platform:

Klaviyo & Mailchimp — template auto-updates, flows don't

Your changes are automatically pushed to the template saved on Klaviyo/Mailchimp's side — you don't need to re-upload anything. However, if a flow or automation has already selected that template for one of its email steps, the flow keeps its own saved copy from the moment it was selected — it does not automatically pick up later edits. To apply your changes, open the flow, go to the relevant email step, and re-select the template (or use the platform's "sync/refresh template" option, if available). Until you do this, customers on that flow will keep receiving the older version.

Omnisend — nothing updates automatically

Omnisend doesn't support live template-syncing from external apps at all. After editing here, use "Download Template", then manually re-upload the file into Omnisend's template library, and update the relevant automation step to point to the newly-uploaded template.

Shopify Flow — nothing updates automatically

Shopify Flow sends its emails through the Shopify Messaging app, and that email keeps its own copy of the code. After editing a template here, click Copy code, then open your workflow → Send marketing email → Edit email → paste the updated code → Save. Until you do this, customers keep receiving the older version.

A few things are specific to Shopify Flow:

Both apps must be installed. Install the Shopify Flow app and the Shopify Messaging app from the Shopify App Store before setting anything up. Without Messaging, the "Send marketing email" action won't appear in your workflow.

Only subscribed customers receive these emails. These are marketing emails, so Shopify delivers them only to customers whose email marketing status is Subscribed. Everyone else is skipped automatically, and you'll see this in Flow → Recent runs. When testing, open the customer in your Shopify admin and confirm their subscription status first.

The subject line is set in Shopify Messaging, not here. The subject you write in Mail Designer is used for Klaviyo, Mailchimp and Omnisend. For Shopify Flow, type the subject into the Messaging email itself. Product details can't be used in the subject, but customer and store details can, for example:

Your wishlist item is waiting, {{ data.customer.first_name }}

Keep the "Add customer tags" step in your workflow. Product cards in the email are filled in from a temporary tag that this step adds to the customer

(wl|{{productHandles}}), and the "Remove customer tags" step clears it afterwards. If you delete the tag step, the email still sends but arrives without any products.

Why this matters

A template showing correctly in this app's live-preview does not guarantee customers are receiving the updated version — the actual email step inside your flow/automation must also reference the latest template. When in doubt, always check the specific flow after making changes.

How to select the correct template for each flow

Wishlist Flow offers 5 email designs (Modern, Minimal, Luxury, Dark Mode, Playful), and each design has a version built for each of the 5 flow-types (Wishlist Reminder, Wishlist Alert, Price Drop Alert, Back in Stock, Low Stock) — giving 25 templates total.

You can select any of the 5 designs for your flow — for example, for your Reminder flow, you can choose Modern-Reminder, Minimal-Reminder, Luxury-Reminder, Dark-Reminder, or Playful-Reminder. All 5 are valid choices for that flow.

Recommendation: keep the design that's already selected in Settings by default, unless you have a specific reason to change it. Here's why: if you select a different design in Settings (say, Playful) than what's already configured on your connected automation platform's flow (say, Klaviyo has Minimal saved), the two can fall out of sync — leading to confusion about which design is actually live, and possibly showing customers a different look than what you see in your Settings preview.

Safest approach: stick with the default design already assigned to each flow. If you do want to change the design, make sure you also update the corresponding flow on your connected platform (see the "Common information about integration" article) so both stay in sync.