I recently had a very similar experience with several notes not syncing up to the cloud service, despite hitting sync multiple times. Fortunately they're not i

I recently had a very similar experience with several notes not syncing up to the cloud service, despite hitting sync multiple times. Fortunately they're not important data however it did highlight to me that there are certainly complications in solving this problem. It also got me thinking about the challenges involved here - both with UI and with trust. If I as a user don't trust that the sync button does what it says on the tin then how does a product regain that trust and what can the UI do to show that it's actually done its job?