Personal Document Area within File Cabinet

We have a requirement to attach sensitive HR related data to an employee record in Netsuite. The files would be pdf, or word documents and would be uploaded on the employee form, (ideally through the employee centre as well as by our HR team on the main employee form). The problem is you view all documents if the folder is unsecure, and only the login user can view a "private" folder.

Does anyone use this concept or have any ideas, as we are trying hard to find a way to secure a folder in the system for each employee (we have 2,000 employees), but allow our HR team to put documents in this folder as well as the individual employee. We don't really want to set up 2000 folders with groups, and ask our users to traverse them to get to their folder.