How can I access audit trails for a specific document?

It is possible to view complete document modification history. You can download the latest version, or even get a copy at any particular workflow step in the past.

If you navigate to Workflow details page in Workflow section, there’s ‘Document Status’ tab that provides access to additional features. Please click the little clock icon to the left from the document name to bring up a popup window. It will contain all the available versions of the document that can be downloaded at will.