While Messages for macOS allows for the deletion of individual photos from a conversation, the photos are not deleted on other iMessage clients so they have to be deleted off of each client that was open at the time. This is a problem when my girlfriend decides to text me risqué photos over the weekend and I left Messages running on my work machine. I guess I have some careful deleting to do tomorrow!
Anyway, I am unable to find out how to delete a photo from a conversation on iOS Messages at all. Is it even possible? The only way to do it appears to be to delete the entire conversation which I do not want to do. Anyone have any clues?