Images can be added in Gmail Settings > General. In the ‘Signature’ section, click the ‘Insert image’ icon above the signature text box and add your image from Drive.
Note: In order for this feature to be visible in Gmail, admins will need to enable external sharing of Drive files in Admin console: Drive > Sharing settings > Sharing options.
Release track:
Rapid release, with Scheduled release coming in early Jan 2015
For more information:
Help Center
Note: all launches are applicable to all Google Apps editions unless otherwise noted
whatsnew.googleapps.com
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