Hi @sitetrec sorry for the inconvenience here and we are actively working to make sync better. We are actively working on adding passwords, and history to the sync chain.
For your problems syncing bookmarks between iOS and desktop, would you mind snapping a picture of you brave://sync screen and roughly how your bookmarks are organized? We have made some recent changes there that might be the problem? Thanks for bearing with us.
HI @Go-go_duck, to help answer your question, the browser encrypts the bookmarks that you add and sends them up to S3 to store. Because they are encrypted such that only your browser with the correct key can understand, nobody else can see them but you and the device you sync.