Hi Bill, we were working on that issue yesterday as we were aware of it. ParaView Glance 4.4.2 solved that issue and I’m going to update the superbuild to bring that version into ParaView 5.8 bundle.
In the meantime, you need to download that standalone HTML and use it to embed your data while using the exporter.
The command line below allow you to get the latest standalone HTML file
curl -O https://kitware.github.io/paraview-glance/nightly/ParaViewGlance.html
That version of Glance also handle the textures that have been exported via PV 5.8.rc2