Whenever you would like to add a review gallery or make any changes to the existing review gallery, you may want to preview the changes first before your customers see them (especially if your store has a lot of traffic). It helps you to identify any mistakes and make sure everything is working as expected.
This feature is only enabled for the APP Professional plan. You need to upgrade the APP plan to Professional, then you are able to click the preview button in the gallery setting page. The button will pop up a dialog where you have to enter the url where you placed your code snippet for that review gallery. For example, for the product page gallery, you may want to enter the url for the one of your product pages (i.e. https://myawesomeshop.com/products/my-awesome-product-1).
We can not offer individual app modifications, however are happy to advise on the best Shopify resources and finding developers to work on your theme.
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