Migrate photo album page from RW5 to RW6

I had been under the impression that iPhoto referenced photos, in RW photo album pages, would show up when opening a RW5 site In RW6.
(If you’ve got existing pages that require upgrading, you should migrate via RapidWeaver 5.4.1 (details here12) as this will copy the files from iPhoto into the project for RapidWeaver 6 to use.
Followed these steps;
Save RW532 site in RW541 via save as.
Open saved RW541 site in RW6.
All photo album pages are there but there are no images in edit or preview.
What did I leave out?
Thank you.