What
Claude Code can send a folder's files to a cloud session. That sync now stops when this computer has no key to sign the files with. You see: "This computer could not be set up to sign synced files (the cloud did not bind it to the session as a device, or its device key could not be read), so this directory's files were not sent."
A related reason explains that the computer could not sign uploads as the device the session is bound to, which the cloud requires.
Why
Cloud sync now appears to require uploads to be signed by a device tied to the session. If your files were not sent, this message says why.
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
Whether this path is behind a switch, and what that switch defaults to, is not stated.