You can create the separate gallery page by using Magento 2 photo gallery extension. Customers can see the images in a lightbox and popup window and also share the images on social platform as well. Magento 2 photo gallery extension also enables you to attach photo gallery to specific products, categories, and sub-categories as well. You can configure slider settings to display the gallery images in a beautiful slider. You can also make SEO settings for photo gallery such as title, URL, Meta keywords etc. It cost you only $69.