How does offline availability for Documents work?
Offline availability lets you access your files and folders even without an internet connection, perfect for times when you're on the move or in areas with limited connectivity. You can also bookmark important files and folders to find them more easily later. Any bookmarks you add will sync automatically once you're back online. To ensure a file or folder is available offline, turn on offline availability while you're still connected to the internet so you can open essential files and folders anytime, anywhere.

What you'll need
Manage offline availability for a file or folder
Open the mobile app.
Tap Documents in the navigation bar or select it from More.
Tap at the right-hand side of the file or folder.
Turn "Available offline" on or off.

When you make a folder available offline, all files and subfolders within it will also be available offline and you can find them in the Offline tab.