Formatting for the field is no longer hardcoded, inline. It is now provided in a twig template, and suitable theme suggestions are provided to allow customization of the field display.
The filename of uploaded file now appears as a caption under the embedded file viewer. The filename is a link to the file displayed within the viewer.
The default width of the document viewer is now 80%, with 10% borders on left and right. The default height remains 400px.