I have a series of INDD documents compiled into a book. When I opened the book today (for the first time since 2015), all of the icons embedded in the various documents are missing. This was expected since I have since reorganized the folder where all icons live. However, I am unable to relink the files. The “relink” button is greyed out, as well as any other menu option relating to relinking the folders, updating links, etc.
All missing links are all AI files, however, there are some other AI files which do link properly.