Request temporary download URLs for Drive files

Requires the same administrator, Drive read scope and unrestricted download permissions as inventory export. Submit 1–500 positive integer attachment IDs. Duplicate IDs are collapsed. Returns one result per distinct ID in request order. Only active Drive files in the authenticated user's firm are eligible. Nonexistent, deleted, inaccessible and foreign-firm IDs all return not_found. Returned blob_id identifies current content and may differ from your snapshot. URLs expire in one hour; obtain them shortly before downloading and request fresh URLs on expiry. This endpoint does not regenerate the inventory.