I don't use Google Drive, so I don't have firsthand knowledge of what is going on. Is Google Drive trying to open the file online to show a pre-view of the photo or does it expect your computer to open the file after downloading it onto your computer? In other words, what program or app is trying to open the file? Maybe someone familiar with viewing photo files using Google Drive can shed some light. The problem seems to be that whatever program is providing the preview, doesn't support .CR3 files, and needs to be updated. Sorry that I can't be of more help.
