Both directions: pick a document from the vault inside a conversation, and
save a received one into the vault at the classification it arrived with.
🔴 **This is the answer to android#15, and the codebase had already given
it.** `Attachment.FILE` has carried this since before the lattice existed:
*the label is a MARKING, not a permission — the content key is in the same
envelope, so whoever can read the message can read the file.* That settles
the ★-property question. The key travels with the file by design, because
that is what makes sending work at all; there is no trusted computing base
to enforce against, since the person holds every key on a device they
control. A client-side refusal would be a suggestion, and **a suggestion
dressed as a control is worse than none** — it is the one people plan
around.
So neither client implements the ★-property, `LabelTest` keeps asserting
that absence, and PARITY.md now says plainly that Files is not mandatory
access control. What it IS: cryptographic read separation, plus a
classification that travels. The picker says so before the tap, in those
words.
Three things found on the way:
🔴 **A second copy of the vocabulary.** `classificationName` in
ChatScreens listed the same four names as `FileLevels`, agreeing by
coincidence with nothing making them agree. Rename a level for the Files
screen and the chat bubble keeps showing the old word for the same number,
in the same conversation, on the same phone. Collapsed to one.
🔴 **Attach and Camera did the same thing.** Both launched the gallery, and
there was no way to send a document at all. Attach now opens a small panel
— photo, or from Files — which keeps the kit's composer row at its four
controls.
🔴 **iOS's picker lists the root only**, so a file inside a folder cannot
be sent from a conversation, and nothing says so — it is simply absent,
which reads as "it isn't there". `LocalVault.allFiles()` walks the whole
tree. Filed as ios#68.
⚠️ The picker is the ONE place this vault hides a row it cannot read.
Everywhere else it insists on showing them, because hiding one leaves
somebody unable to see anything is there; a picker exists only for
choosing, and a row that can never be chosen is furniture.
⚠️ A received file is always saved as an encrypted copy, never a link —
there is no file on this phone to point at — and always at the label it
arrived with. Re-labelling somebody else's document on receipt would
launder its classification, and the number is the only thing that survived
the trip.
9 new tests. Each guard proved by breaking the code: writing the label for
every attachment kind fails the image test; dropping compartments fails
the two that name them; removing the fallback caption fails the
older-build test.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
