DVA Problem?

Ok. Upgrade from 2012 on Linux seemed to work smoothly. I must have a functional DVA because it renders Word files and Excel files. Appears to be properly linked to POA Agent. However, DVA will not render tif attachments. Is this by design? Do I need to modify settings to view tif files? Most of time users get faxes forwarded as tif attachments and need to view them.