Once a document has been attached to a post, you may view it by opening the post and clicking the View Document icon.
The document is opened in a separate Document Viewer.
Note:
If a document is attached to a post or a Discussion Thread that is associated with a Workspace, then a user with rights to the Workspace will be able to view it regardless if he/she has rights to the Document Type. If a document is attached to a post or a Discussion Thread that was created at the document level, then a user must have rights to the attachment's Document Type to be able to view it.