This used to be my favorite document manager, but it has been unusable for nearly a year. Dropbox Sync is a key feature, but it has not worked since iOS 10 was introduced. It is still not fixed in Documents 6. If you can get Sync to complete once, it will still fail to update in the future. Developer has tried to address problems through some version updates, but it still doesnt work. Deleting app, deleting Dropbox account, deleting synchronized folder, and totally restarting with a fresh installation doesnt help. Nothing will get Dropbox to sync any more.
LuckysClub about Documents: File Manager & Docs, v6.0