We can  use  the  Document  Module.  By default, under hr.employee model ie. Employee Form, you can see one of smart button in the name of Documents. By simply clicking, it will trigger into the document module. here we can able to create separate workspace and keep the documents as well. So we can explore the end to end feature of fundamental document module.

Create Employees 

• To Create an Employee, go to the employee module and click on create 

• Fill up the Necessary fields

If you scroll down, you’ll get more fields of information such as work information where you’ll be able to enter employees’ salaries and other beneficiary information.

you can add attachment in chatter

Hi,

If you need the functionality for storing documents related to each employee then you can use the following free community app.

https://apps.odoo.com/apps/modules/14.0/oh_employee_documents_expiry/

Regards