Steps
- From the app admin page, click Options
- On the Option column, find the option you want to show as dropdown list
- From Display style of this option, select Automated variant image swatch
- Click Save to apply the changes
Upload variant image for swatch
This setting Automated variant image swatch will take data from the variant image on the Shopify product admin page → Please upload an image for each variant of the product
Here is the result you will see
