PDF previews allow users to checkout handsome previews of PDF files. This can be acheived by downloading and installing a web browser PDF viewer like the Adobe Acrobat Reader DC. This is a free reader and can be downloaded by going to Adobe Acrobat Reader DC download. Other plug-ins may also work, but no other PDF plugins were tested at the moment. PDF previews will be an ongoing feature to be fine-tuned. The end goal is to get a stand alone solution for PDF display and not need the Adobe Reader plug-in.
Example of PDF file selection with no PDF Viewer installed.
Adobe Acrobat Reader DC
Settings, allow PDF preview.
ThatFile PDF Preview with Adobe Acrobat Reader DC installed.