- Settings can turn on sync for books and reading data. Books, covers, shelves, tags, excerpts, bookmarks, progress, and reading time are encrypted and sent to your own S3 or WebDAV. Until you turn it on, only configuration is synced. - Sync status shows the current stage, the file in transit, and how many records are still waiting. A failed sync can be retried. - Excerpts and reading positions keep earlier versions. You can compare and restore them after a deletion or overwrite. That history stays on this device. - A password-protected library backup can be exported. If books and covers together exceed 128 MiB, the export fails instead of writing a truncated file. - Select text while reading to explain, translate, summarize, or ask a follow-up with the model you already configured, and save the reply as a note. - The bookshelf shows only the search field until you open filters for status, sort, and tags. - On the phone, a finger slide now finishes the page turn, and the motion is smoother. An existing install does not start uploading the library until you turn that sync on in Settings.