1. Make sure you can connect to Google or Dropbox service.
2. Please sign in with your Google or Dropbox account before you open file from it.
3. If you’re using some Firewall or Proxy software, please add the Cloud Drive services through. (Include all subdomain.)
Such as: google.com / googleapis.com / dropbox.com
4. If you still can’t open it, don’t hesitate to send email to us: firstname.lastname@example.org