iCloud Music Library and multi-CD audiobooks: Duplicate error
First what I did was create a backup of the media folder (containing the imported files) under Music/iTunes/iTunes Media/Music/ARTIST/ALBUM

Then, I just deleted the entire collection on iTunes (Choosing delete songs instead of remove downloads). This deletes the copy store in iTunes folder, but not the backup I created.

Last, I just refreshed iTunes by going to File &gt; Add to Library &gt; (backup folder), and it copied the files back in, add uploaded them all at once, which solved the problem.