Adding to Paperpile when link opens PDF in Google Drive

How do I do this?

I saw someone’s CV, and all of their publications are links to the papers in Google Drive.

The PDF opens in Google Drive style, and I can even open it in MetaPDF. However, in both cases the P(aperpile) button in my browser isn’t interested in adding the reference.

Without going through the trouble of download a hard copy and opening that in my browser, then adding, how do I add this to Paperpile elegantly/ fluidly? It just seems like pdf’s shared via GD should be easy to add!