Attachments
How files are encrypted and stored, and the preview limitation to know.
You can attach files to messages. They're handled with the same privacy model as message bodies.
How attachments are protected
- Files you attach are encrypted before they leave your device's session and before they're stored.
- They're held as opaque encrypted blobs — the storage layer can't see their contents.
- When you download an attachment, it's decrypted on your side.
One limitation to know
Attachment preview is download-only. There's no inline image or PDF preview in the message view. Because files are decrypted on your device only when you download them, you'll download an attachment to open it rather than see it previewed inline.
Where attachments are stored (and where they're going)
Today, encrypted attachment blobs are stored on conventional cloud object storage. Because they're already opaque encrypted blobs behind a storage abstraction, the plan is to move them to Walrus, a decentralized blob-storage network, with no change to how encryption works for you.
This is a roadmap item — it doesn't change anything you do today, and your files stay encrypted either way.