Enabling PDF Thumbnail Previews in Nautilus

How does one enable PDF Thumbnail previews in Nautilus? I went through the usual routine of clearing the thumbnail cache, reinstalling Evince, checking Dconf settings, etc. It seems to me when I ran Fedora Workstation, I saw PDF previews in Nautilus. As an academic with thousands of PDFs stored locally (and failing sight), it really helps to see large thumbnails. Thanks so much in advance!