How to Enable Document Handling for a User?

How to enable Document Handling for a user 

Scenario: I have created a purchase requisition order and was trying to attach document notes corresponding to the purchase requisition header then I started getting error “Document handling is inactive for this user (view options)”. 
 
Error:

High level resolution steps 

    • Navigate to User Options. 
    • Activate the document handling. 

    Detailed resolution steps 

      Step 1: Navigate to the “User Options” by clicking on the settings icon in the top-right corner of the default

      Step 2:  Click on the “Preferences” pane, and under the “Miscellaneous” tab, enable Document Handling. 

      Output:  

      Once Document Handling is enabled, the user will be able to access the Attachments screen.