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Auto sync on a timer (Settings → Sync), default off, minimum 1 minute. Quiet by design: a notice only when files actually moved or a run failed; a ⏱ in the status bar shows it is armed. An idle run is a single Drive API call, so a 1-minute interval is affordable at any vault size.
Settings are also reorganised into Step 1 (OAuth client) → Step 2 (refresh token) → Step 3 (vault root folder), with a banner naming whatever is still missing.