Thumbnail Views in PCManFM Lubuntu 18.04

Does anybody know how to make the file manager show thumbnails of Album Artwork Covers on the folders in Lubuntu?
I have a music library of folders with complete artists and albums with artwork in each. Windows Explorer shows cover artwork as thumbnails on each folder, But my Linux will not. Is there something I need to do on Linux side? I have thumbnail enabled in views, but no luck.