6.4: dc:title/pdf:Title not showing when viewing a published PDF



so I have a PDF here where the metadata (dc:title and pdf:Title) fields have been entered. I then published the PDF and viewed it's contents inside the browser.

The problem is that title showing for the PDF is the filename instead of the one I declared on the metadata.

What do I need to do so the metadata title (either dc:title or pdf:Title) shows as the PDF title when viewing in a browser.