Kindly upgrade brave to have true sync option available (i.e., seamless sync of password, bookmarks, settings, history across all the connected devices)
This feature is a must to have since 2012 .
Many of the existing user have already requested you for this feature and is a must nowadays.
Implementation can be done by two ways
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Like chrome save user date to cloud storage and sync it with all any connected devices of the same account.
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Can use portion of how syncthing works and use it in brave to achieve desired result (e i.e., encrypt user data and store on user device locally tyen when a new device connect to the sync chain the user data is downloaded to the new device and sync successful)