To sync progress, you can use `https://sync.koreader.rocks/ https://sync.koreader.rocks/` as a custom sync server. While in a book, top bar, settings, "Progress

To sync progress, you can use `https://sync.koreader.rocks/ https://sync.koreader.rocks/` as a custom sync server. While in a book, top bar, settings, "Progress sync". I think it works using the file name of the epub. Not sure.