You can sync documents from Dropbox in Notes Writer. For example, go to “Local Documents” location, tap the “+” option then tap “Copy from Dropbox”. It will ask for your login data then you can select a document that will be downloaded and synced. If you open that document and edit it, when you close it automatically syncs with Dropbox.
If you need quick access and sync to some Dropbox folders, use the “Copy from Dropbox” option then navigate to a subfolder and tap the “QuickLink” option. A new folder will be created in “All Notes” root folder.
You can also install the official Dropbox app on your iPad and use the “In Files App” location to open directly in place documents from the Dropbox location. Please, find more details in the following articles: