What do I do to have my photos run as a ribbon below the writing I want to insert them in?

Please read the following user tip and restate your question/problem in detail: 

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Writing in what app?

And by "run" what do yo mean? Scrolling across the screen or just a number of photos side by side at the bottom of a page?

Where are your photos stored? If they are in a Photos library you can assemble a few in an album and create a book from that album (you can add additional photos later) with PrestoPhotos.

It can create excellent hard cover and softcover books. It is primarily designed for photos but have options for a full page of text and can modify pages of one photo to add as much text to the page as necessary. And the photos that are in the album are shown below, greyout if already on a page and not greyed out if not in the book:

It's the provider that is most like Apple when Apple was providing books.

In the past what type of computer were you on and what app were you using to be able to scroll photos at the bottom of a written page.