Zakeke automatically pulls the product image your customers will see in the customizer from your store. You're free to change it in Zakeke if you wish, but knowing that it won't change the product image in the store.
You can still change the product image inside your store and have it matched inside Zakeke. Follow these guidelines:
- go to your Shopify admin, replace the product image and save the settings
- go to the Customizable products section inside Zakeke, select the product and click on the three bullets on the right
- select "Sync image/name with e-commerce"