Can I move photos already posted to Instagram?

Sadly, you can only move photos you are planning on posting to Instagram. That way you can effectively plan your content for the future to see how it aligns with how your feed is currently set up.

If you'd like to see how your existing Instagram feed would look after deleting/archiving a post, use the Phantom Mode feature by tapping on "HIDE" at the bottom of your grid space screen and tapping on the images you'd like to hide.