Missing (Vanished) folder in Network but still there online

Right. This is a common network permission problem sometimes associated with third party programs and/or OS such as macOS that mutilate (yes, really) user file and folder permissions on network drives such as the My Cloud Home (MCH).

Most MCH users on this subforum would have known about this because it is duplicated in about a dozen different threads.

The Western Digital Tech support solution is to have a Dashboard functionality that resets all user files and folders permission without deleting user data (hopefully).