You can automatically display modal when user loads an out-of-stock product. Simply turn on
Modal > Display Onload to use this configuration. Keep in mind that modal won't be automatically shown if user has already seen modal popup for the same product (for better user experience).
By prompting users to subscribe for back-in-stock notifications, you could get more email subscribers to your email list. Things to consider when using this approach.
- Only works for product page.
- Will only be shown if product is fully out of stock. If any product variants is available, modal won't be automatically shown.