How to sync a folder for offline access
To sync a folder for offline access, open the drive from the Finder app.
Right click (Control ⌃ + Click) on the folder you want to sync and click Sync for offline access.

Known Behaviors and Limitations:
The feature has the following known limitations:
- You can sync a folder and exclude any of its subfolders from syncing, with the following limitations:
- Renaming excluded folders or any of their parent folders is only allowed when connected to the internet.
- Excluded folders can’t be moved to different folders on the Desktop App. The Web UI can be used as an alternative.
- Moving content between folders marked for sync and folders that are not marked for sync is not currently allowed in the Desktop App. However, copying or moving the folder through the web UI is allowed.
- The maximum number of files you can sync for offline access is 500,000 per user on the machine.
When it comes to preserving unsynchronized content, the following behaviors apply:
- When you remove your drive or unsync a folder, any unsynchronized files will be moved to a folder on your desktop.