Reduce the size of photo sent with Messages.app on iPhone When using Apple’s Mail.app, a mail message offers a pop-up menu to reduce the size of an enclosed image.

➥ How can I do the same when shooting and sending photos from within Messages.app on an iPhone? 

Currently my iPhone sends out huge 3.3 meg files where 120K would do.
I cannot comment on popup asking for file size, but in Messages settings, Low image quality mode can be turned on. See last option in Settings -> messages It will be set for all images.