Viewport preview

The viewport preview feature is already available in the default 3ds Max projects which are created by the App Manager. See below for the information on how to enable if you didn't use the App Manager to create your asset files.
To enable the viewport preview in 3ds Max, switch from "Standard" to "High Quality" in the viewport settings, select "Realistic Materials with Maps" from the Materials submenu and set "Environment Background" in the "Viewport Background" submenu under "Default Shading".