I, too was confused by that setting. It turns out that media attached to an MMS ...

		simoncion on July 27, 2015 \| parent \| context \| favorite \| on: Major Flaw in Android Phones Would Let Hackers in ... I, too was confused by that setting. It turns out that media attached to an MMS message is not decoded until you actually open the attachment. See: https://github.com/WhisperSystems/TextSecure/issues/3817