I am unable to attach documents. I click on Files add the document but it seems like the part that says Upload Attachments should be a button to attach the documents but it's not indicated as a button. Is there something I should do to get an attachment to attach to a discussion?

Once you select an attachment there is a background process as the document uploads to the server to be checked. You may notice an uploading message in your browser status bar.

As that is what I get, once the document is uploaded options appear to place the document within the post.