Alone, or with Everyone fetches it, a page link with plain-file tracks plays through SharedLinks.local (a SharedSource without the upload): it resumes after a cut, backs off on 412/429/5xx and resolves the page again on 403/410/412, where ffmpeg's own reconnect gave up for good. Pieces tracks and a reader that cannot open keep yt-dlp's URLs as before. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>