Reads upload defaults from the authenticated user's YouTube channel, upcoming live broadcasts, and recent uploads (language fallback only). Category is never inferred from old uploads because that reflects past videos, not Studio upload defaults.
OAuth access token with YouTube read scope.
Optional
Optional abort signal.
Account defaults sourced only from YouTube Data API responses.
Reads upload defaults from the authenticated user's YouTube channel, upcoming live broadcasts, and recent uploads (language fallback only). Category is never inferred from old uploads because that reflects past videos, not Studio upload defaults.