autodesk forge – Loading DWF document with 3D annotations in Viewer

We are trying to load a local ‘DWF’ document into the Viewer according to what is explained here: aps.autodesk.com/blog/dwf-and-pdf-support-forge-viewer

The DWF file is created from an Inventor Part and contains 3D annotations. The Viewer inside Autodesk Vault client is nicely showing the annotations, but when we load the same DWF file into the Viewer in our own web application the 3D annotations are not shown. See images below. Is there an extension which we should load\enable?

Regards,
Pim Saarloos

DWF loaded in Viewer in Autodesk Vault client

DWF (the same) loaded in de Viewer in our own web application

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