???? - not what I requested.
Are you selecting the assets from the
Filter Palette or the
Assets Palette? You should be selecting them from the Assets Palette which lists all the assets you have installed. The Filter Palette, depending on the filter setting, may include assets that are on the Download Station (DLS) but are not installed.
See
Placement:_Scenery_Mesh_Objects for an example of how to select and place an object into your Trainz World.