I'm making a book but when I go to the book module I get a '!' on the left corner of my photo's and this means that the photo can't be found or is offline.
I've made books in the past and this never happened. I don't know what I'm doing wrong right now.
Several things could have happened. The images could be on an external hard drive that is presently not connected. The images have been moved but were done so not using Lightroom. The images have been deleted but Lightroom wasn't used to delete them. Regardless of what happened, the images are not in the location where Lightroom expects them to be.