Need to make an existing document confidential? You don't need to upload a new version to do it.
If you're uploading documents that only certain people in your organization should have access to, mark them as confidential.
Only the selected version of the document is set as confidential. Other versions of the document can be marked as confidential if required. To view previous versions of a document, click the Show Document History checkbox.
You can also select and update several current documents and set them as confidential using Bulk Edit, Historical documents need to be manually set as confidential.