Now, in a plain text editor, paste in that embed code from Flickr, and save it as an .HTML file. You don't need anything else; just the embed code that you have copied from Flickr. Upload that HTML into the Files area of your Canvas course.
For example, I called mine GrowthCatsFlickr.html, and you can see it here: Flickr album in Canvas File.
<iframe style="display: block; margin-left: auto; margin-right: auto;" src="https://______/courses/______/files/______/download" width="___" height="___"></iframe>
So, for example, here is what I will use for my Flickr album:
<iframe style="display: block; margin-left: auto; margin-right: auto;" src="https://canvas.ou.edu/courses/56971/files/3858529/download" width="420" height="600"></iframe>
Now, I'll create a Canvas Page, and I'll paste the iframe into the HTML editing view of the page. Here is the page: Flickr Album in Canvas, with a screenshot. The left-right arrows move you through the album, and each image links back to its Flickr page; you can see the page in action here: Flickr Cats in Canvas.
You can also insert a Flickr album into a Discussion Board if you want students to choose images to respond to:
This post also appears in the Canvas Community Instructional Designers group.