A YouTube user named Nick Keck has uploaded a video demonstrating that your
The demonstration only addresses this flaw as it pertains to videos, but it seems to be a reasonable leap of logic that, as expressed by Keck, if videos are retrievable, pictures are retrievable.
There's a big caveat though for you privacy-obsessed folks out there – this is not proof that Snapchat saves your stuff on their company-owned servers. The only thing this demonstration shows is that the message remains saved on the recipient's device. To retrieve it, one would have to be at least slightly tech-savvy to navigate the phone's file system, whether it's on a jailbroken phone or by way of computer software.
Note: The demonstration below makes use of a jailbroken phone but doesn't appear to have anything to do with the vulnerability. In this case it was jailbroken to install the iFile app to browse the phone's file system.