Books iCloud Cache
The last round of updates resurrected what I assume is a Books cache in iCloud.
When I sync my Books on my Mac with my iPad or iPhone, it now gives me a warning that certain books cannot be synced because they cannot be found.
When I saved the error file, it contained a long list of audiobooks that I deleted so long ago that meantime I changed my iPhone, and clean installed my Mac.
They are not visible in the manage iCloud list and they are not in the Books folder.
Any ideas on how to get delete these phantom files?