GNOME GMail integrates the GMail web interface into the GNOME environment. Once installed, GMail becomes a choice as the default Mail Reader in the GNOME Preferred Applications administration application. When selected, a GMail web page will be used whenever an email service is requested.
File attachments are supported, as well as the setting of Subject, Cc, Bcc, etc.
Logout, or launch GNOME GMail, to complete the configuration.
To demonstrate, select "Send To..." on a file in the File Browser.