cURL
Post apitransfers preview metadata
Run metadata extraction on a not-yet-completed upload, without persisting.
Used by the staging UX: after the browser PUTs the file to MinIO but before calling /complete/, the UI fetches a metadata preview so the user can review/edit/discard before committing the asset.
Source-size cap (METADATA_PREVIEW_MAX_BYTES, default 100 MB) keeps
the preview path fast and avoids surprise multi-GB downloads from the
repo agent into the console pod.
POST
cURL