In Narrative it's easy to build complex grids, grids are stacked, so when you put images side-by-side they are horizontally aligned and if the have the same aspect ratio they will be made the same height and width

Drop images side-by-side:

If you already have images that are already side-by-side you can add another photo beneath one another

Drop images beneath one another:

Place images between others:

Experiment with different layouts:

Mixed use of portrait and landscape photos:

A take on a classic triptych:

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