Tony,
I understand you methology, as I also only manually attach my media items. I have been using copy and paste to Word and then attaching. I have never attached a file directly from Ancestry as I want the file, not the link. This situation also occurs when I attach a family photo scanned to my hard dive picture collection and then attached. Multiple photos for the same person appears. You copy and paste to notes, I compile mainly in the media location. Maybe that is the connection.
I will try to utilize the notes location and see if that resoves the issue.
Thanks for the response.................Ron
PS: As a side note, I also had multiple copies appear when I migrated the file from the PC to the Mac, sometimes as may as 24 copies of the same media file. I assumed this to be a different issue than that associated with the migration step, but maybe they are associate, don't know.