project created in blender 2.8 materials should render like previews in eevee or cycles
STL (Stereolithography, filesize: 393 KB), OBJ (OBJ, filesize: 511 KB), ABC (Alembic, filesize: 287 KB), DAE (Collada, filesize: 360 KB), BLEND (Blender, filesize: 2.38 MB), OTHER (Other, filesize: 17.8 KB), FBX (Autodesk FBX, filesize: 235 KB), GLTF (glTF, filesize: 30 MB)