Using the script that you can find on Github from Andreas Hochsteger, you can automatically save attachments that arrive via email in your GMail account in a selected Drive folder.

Options :

• Choose what kind of files
• Choose the destination folder
• Rename the file (or not)
• Archive the email or not
• Export the emailthread as pdf
• ....

Enjoy !

You can find the script here :

https://github.com/ahochsteger/gmail2gdrive/blob/master/README.md