Have a more helpful errror message for when idesign cannot package the file.
Currently the error message displayed just says 'InDesign could not package the document "____". Cannot copy necessary linked file(s). This is super unhelpful when I have hundreds of links in my document and am given no hints as to which file is the issue or what the issue is. As a result I'm left stabbing in the dark trying to work out what the problem might be amongst hundreds of files.