If you have a Private folder tools enabled, you can access the Vault you would like to upload the document, then follow these steps:

1. Click on the Private section.

2. Right-click or click on the plus button.

3. Click on Upload Private Documents.

4. Select the location. (*Optional - Click on Toggle Document Visibility to confirm verify other documents inside the location selected.)

5. Click Upload

Or simply:

1. Find the location.

2. Drag & Drop directly to the folder.