I’ve added a new page for photos … We’re starting with a simple grid of photo thumbnails …, each linking to the microblog post. …

It uses CSS Grid Layout, so you can also customize a bunch of things without changing the template. For example, to change it to 5 equally-spaced columns, click Posts → Design → Edit CSS and paste in:

.photos-grid-container {
    grid-template-columns: 20% 20% 20% 20% 20% !important;

Source: Manton Reece - New photos page for Micro.blog-hosted blogs.