Tried to delete and the computer said....you've heard it before.
I've moved the photos and the description from the original entry added by Carnkie to the duplicate, and then deleted the old entry (easier than moving the documents from duplicate to original!)
The reason you couldn't delete the duplicate was you'd already uploaded documents; the system won't let mines/quarries/sites be deleted when photo(s) or document(s) have been added.
It's just a safeguard against admins/editors mistakenly deleting duplicates before being sure that all content has either been explicitly deleted, or moved.
Thank you for sharing the documents 🙂
my orders are to sit here and watch the world go by