Variable AttachmentBlobStoreUnavailableErrorConst
AttachmentBlobStoreUnavailableError: "Storage-backed attachments are not available on this host. Only inline attachments are supported." = 'Storage-backed attachments are not available on this host. Only inline attachments are supported.'
The error an attachment operation reports when it needs storage and no store is bound.
A distinct, recognizable message so a caller can tell "this host does not do storage-backed attachments" apart from "storage is configured but failed" — the first is a deployment shape, the second is an incident.