Machine-readable reason on success:false rows: invalid_input (the input line could not be used: a free failure), no_text, too_large, limit_reached, blocked, timeout, network, rate_limited, http_error, download_failed, unsupported, unsupported_platform, private_media, not_found, no_media, multiple_media, private_link (a share link that is not public), needs_login (the link opened a sign-in page), quota_exceeded (the host's download quota: retry later), not_audio (a file that is not audio or video), folder_link, link_expired, link_invalid, failed. Absent on success rows.