Why do I get a "This photo is not editable" message in iOS 8? I have photos in my iPhone that were added using iTunes sync with a Photos library. I do not see a way to delete them (no trash can icon) and when I tap "Edit" while viewing them I get the following message:

This photo is not editable
Do you want to duplicate it and edit a copy?


I understand that I can make a copy and edit that, but then the original will still appear on my phone and there is no way to delete it.

How can I edit these photos so that only the edited version appears on my phone?
If you mistakenly try to edit a photo in your Photo Stream album, you will get this message.  Edit the same photo in your Camera Roll album and it should be editable with no problems,