You can create collage pages with more than one photo per page in your Classic Book using the Chatbooks app on iOS or Android.
How do I make a collage from photos already in my book?
Tap your book
Tap the photos you'd like to collage
Tap Collage
Change or replace photos if you'd like, then tap Done
Tap Done again
How do I make a collage with new photos?
Tap the + in the lower right corner
Tap Collage
Select the number of photos you'd like in your collage and continue
Change or replace photos if you'd like, then tap Done
Tap Done again
How do I edit a collage?
Tap the collage page, then tap Edit Collage
To turn the photos back into individual pages, tap "Convert to individual."
To crop a photo or swap it for a different one, tap the photo
To move a photo to a different spot in the layout, tap and hold it, then drag it
When everything looks right, tap Done
Can Chatbooks collage my photos for me?
Yes. Smart Collage can collage your photos so your book fits a lower price range. See How do I fit my Classic Book into fewer pages?