• Click on the ‘Features’ from the left panel.
• Click on ‘Document’ from the expanded menu.
• Select the project for which you would like to add a confidential document.
• You can add your confidential document to ‘Master’ folder of the project.

• You can directly upload a file or create a folder and add the multiple documents.
• You can define the access permission by clicking 

• Once all the actions are done, click on ‘Save’.