You will need to find the correct URL for your Nest Cam still image. To do this make the camera public. Navigate to the URL given by Nest. View the source for that page. Find a line that starts.....

This Trigger fires every single day at a specific time set by you.

This action will download a file at a given URL and add it to Google Drive at the path you specify. NOTE: 100 MB file size limit.

Nest Cam Daily Snapshot (Time Lapse)