I used an existing listing and copied with a new photo to a new listing however old photo remains in the new listing but only in the app not on my computer. I have restarted my phone several times but still there. Any suggestions would be welcome.
Did you click the garbage can to delete the old image?
I don't know. It may take a day or two for the copied listing to have the photos. You did remove the photo and you did use copy? Just asking because I have thought I used copy when I used edit instead and I have also not removed the photos and hit apply when creating a new listing on the new template.
You can try editing the listing and adding the photo again.
@MeAndMyPaperCuts: There have been persistent reports of the apps not synchronizing properly. Sometimes logging in and out of the app (or in worst case uninstalling and reinstalling it) works.