Hi all,
I am using this plugin and it is working great to manage collections for the books I have in Calibre that I didn't purchase through Amazon. However, now all the e-books I did get through Amazon have become un-collected! I went from having a handful of new books that I hadn't got around to categorizing yet to having over 100.

How can I get the plugin to work to put these in my collections? I've been wrestling with this all night and I can't figure it out. They aren't in my Calibre library, so I can't really modify them in there, can I?