How syncing works
Keeping your library and progress consistent everywhere.
Once the extension is linked, your library and progress stay in sync between your device and the website. Add or update a title in the extension and it appears on the site; update something on the site and it shows up in the extension. Episode, chapter and volume progress sync both ways.
Progress only ever moves forward during a sync, so a lower or blank count never overwrites a higher one you already have. If you make conflicting changes in both places, syncing resolves them without losing or duplicating your data.