Hi @tnorthcutt
There’s no straight forward solution for this, as the gallery / image field allow you to select an image which has already been uploaded and used on a nother post.
If ACF were to delete the image (if removed from one post), it would then remove the image from the library causing post 2 to show an error where the image used to be.
To get around this, ACF would have to test if the image was used elsewhere in the site, etc, etc, bloat.
Because of the amount of code involved in this, I would rather keep ACF light weight and nimble.
Thanks for understanding
Cheers
E
