Local filesystem archival is planned for a later SDK release. The current TypeScript client does not expose a storage adapter, so the API requires callers to provide their own persistence for downloaded JSON, JWS and PDF bytes.
Until that adapter is released, do not configure local-v1 or treat a successful API response as an archived file. Keep the API keys and any downloaded documents on your server.
The storage contract will be documented here before it is enabled in the client.