Files Pro supports linking to various cloud servers, for example Dropbox.
You can link to a cloud service from the root view, or in the Cloud Server settings.
Once linked you have access to all the files and folders stored on the remote cloud server. You can view documents and perform standard actions such as move, copy and email etc. You can copy and move documents and folders between cloud servers and local folders.
When you view a document its data will be downloaded and stored locally for offline access. If you want to store all documents contained in a folder for offline access you can use the "Sync" edit action (available after tapping the "action" button in the folder list view). The sync action will download the content of all documents in the current folder for offline access. It does not sync sub-folders.
You can view account information, reset the local storage and unlink the account in the Cloud Server settings. These are found in Files Pro's main settings accessed via the gear toolbar icon.