preview: sending a very large photo no longer costs the app gigabytes of memory. Before encrypting a picture Staircase decodes it to strip the location, camera and time it carries; that decode is now inside a fixed budget, so a phone's own photos are still re-encoded at full size while far larger pictures are quietly shrunk instead of holding gigabytes (a 1.7-gigapixel image was measured at 3.4 GB before, 147 MB now). A picture that still cannot be rewritten says so and is sent as it is.