I have an InDesign Book that I'm trying to export. The book contains several documents that have videos, with which I've set jpeg Posters. However, when I try to export, I get an error message that says
"The file was exported but one or more problems were detected:
Link: 6 missing."
It so happens I have 6 videos with posters, and all of those poster images are missing from the final ePub, though the videos and epub overall play fine. Any ideas as to what could be happening here?