iCloud Messages really needs an Optimize Storage option.
@paul I periodically scroll through the media-heavy messages on my desktop Mac and drag-and-drop the photos I want to keep to a folder on an external archive drive — then I know I can delete them. I can't seem to do that in bulk.
That's the only way I know to get individual images saved where I want them — which is not in the Photos app.
It's the same "hidden" drag-and-drop feature that Apple Music has where you can copy track files elsewhere by dragging from the app