This meta bug will follow issues relating to the inserting and manipulation of 3D models first introduced in LO 4.3. https://wiki.documentfoundation.org/ReleaseNotes/4.3#3D_models http://zolnaitamas.blogspot.ae/2014/08/3d-models-in-impress-libreoffice-43.html
LibreOffice 6.0 removed support for 3D models. tdf#103884 remove gltf/collada feature https://cgit.freedesktop.org/libreoffice/core/commit/?id=08a43cc97ccf88faa9d3a04afc3aacd2c885a2d1