Line Managers unlike HR users can see only those who report to them.
From the My Employees page, line managers can view their employees profile by clicking the icon.
From here you will be able to access your employee's profile and edit the employee's record.
The employees profile like you own profile can be edited by you (their line manager). However it will not need to be approved a second time by a HR user. Depending on line manager permissions you will be able to add and delete employee documents.
To add a new document you must enter a title name, whether it is going to be visible to the employee. Then from here you can either add another document or you can upload the document(s)
Note: Line manager's permissions are set by the HR User so some of these options may not appear.