title: DWG file does not show up in Forge viewer
body: <p>I am using Forge Viewer, tested with both Viewer version 2.17 and 4.0, but cannot view DWG files. Those same DWG files can view in Autodesk Viewer (<a href="https://viewer.autodesk.com/" rel="nofollow noreferrer">https://viewer.autodesk.com/</a>). I checked all the files were uploaded successfully to my Forge bucket and they return appropriate URNs. However the Viewer returns error 404 (not found) at <a href="https://developer.api.autodesk.com/derivativeservice/v2/manifest/" rel="nofollow noreferrer">https://developer.api.autodesk.com/derivativeservice/v2/manifest/</a>{{urn}}</p>
  
  <p>My app can view DWF files perfectly, but DWG files cannot. I don't know what is the difference since they use the same code to upload and view.</p>
  
  <p>I checked the Forge API was updated to use hub, my code uses only storage location. I don't know it will make something difference or not.</p>
  
  <p>Thank you.</p>