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As described in this thread, the new version of dropbox backup is great but has a major downside: files stored via backups can no longer be accessed within the dropbox app! Quoting @mbriney from ...
I couldn't agree more. I had the awful idea to switch to backups and the main functionality I used to have (access to all my files _immediately_ from all devices) is now gone. This sucks big time. And apparently it's been reported more than a year ago. Access via the app is paramount. The browser access is not really a substitute. A patch, maybe (?), but not even close to a substitute.
Considering switching to a different similar service (ANY other) that provides this *basic* feature.