Not the most intuitive support system from Adobe so here goes a second attempt.
Any suggestions about dealing with v5.7 problem with uploading book to pdf would be most appreciated. I have a book set up to go to Blurb, but first attempting an upload to pdf. About 20% of th edraft book are showing as "photos off line will be omitted"!
Most have successfully uploaded before to another book.
I can start again but will take many hours.
Photos are combination of tiff and jpg, all old photos from around 1920s to 1960s.
How can I fix this issue?
Are some of the originals on an external hard drive? If so you will need to connect it to the computer.