There is a situation in which a change to the story in Family Search isn’t registering as a change (ie the double arrow) in Family Search when doing the compare.
The scenario seems to be
(1) Story has been created in Family Search
(2) Story has been copied to Roots Finder
(3) Photo is attached to story, photo contributed by a different user to Family Search, but photo is included in one of my albums
(4) Change is not registered. Have to delete the Roots FInder story and recopy.