I was making a book for my friend who is going to graduate.

It was a large 20 page document entirely filled with pictures that I was planning to cut out and stick in a book.

I saved it, and when I went back to it ALL the pictures were "invalid" and I couldn't see them anymore! :( :(

I'll be very sad if I can't get them back :(

Please, I would be very, very grateful if you could help me!!