The images are missing in the customer back in stock emails. How to fix?
The extension's functionality is based on Magento native product alerts. Therefore, please make sure that your configuration of static and media URLs at Magento Admin Panel → Stores → Configuration → General → Web → Base URL is correct, otherwise, Magento determines pub/ directory on request.
There, please paste {{unsecure_base_url}} in Base URL for Static View Files and Base URL for User Media Files and {{secure_base_url}} in Secure Base URL for Static View Files and Secure Base URL for User Media Files.