Chances are you've received requests from members for PDF invoices. Now, with the PDF Invoice Add-on you can allow your customers to download a PDF invoice for every transaction – themselves.
PDF invoice makes compliance easier for your customers, provides them with a seamless branded experience, and saves them time. Enjoy a simple-to-use dashboard and choose from two attractive designs.

Lets ye usage the files hosted about you Google Drive as like Download Monitor files.

File download icons are usually very limited in number or in file format, so how about building your own icon set? WP File Download plugin, by taking advantage of the .SVG format,