To connect your Google Drive folder, upload a Service Account JSON key to the server.
Steps:
1. Go to console.cloud.google.com
2. Create project → Enable Google Drive API
3. IAM & Admin → Service Accounts → Create → Download JSON key
4. Share your Drive folder with the service account email
5. Upload the JSON file to the server as gdrive-key.json
Then share your Drive folder with:
(upload the key file first to see the email)