• Local only — moves and renames existing files and rebuilds NFO/info.json sidecars from stored metadata. No network.
• Online mode — everything Local does, plus backfills sidecars that were never downloaded (missing thumbnails and subtitles) with one yt-dlp fetch per affected video per missing item. Note: Subtitles are rarely available and can easily double the time and effort required to implement your plan—consider whether they’re truly necessary.
• Full sync — everything Online does, plus schedules a full media re-download for items whose on-disk format no longer matches the profile (an audio-only vs video switch, or a container change — e.g. the profile now produces .mkv but the file is .mp4; a video profile with no explicit container produces .mp4). Re-downloads run after the reconcile finishes and do use bandwidth — review the Re-downloads list before applying. Note: Changes to resolution or embedded features are not detected; the only way to address this is to force a Redownload Everything at the source level.

Reconcile one source, or everything at once (e.g. after changing a global setting like restricted filenames).