Dwig, Thanks for your reply. I'm using the latest ver. of PS. I see File>Export>Save for Web(Legacy) which implies that there is a new way of saving for the web so it seems that there is something in Photoshop CC 2015 called Adobe Generator that I'm now researching:
http://blogs.adobe.com/crawlspace/2015/06/save-for-web-in-photoshop-cc-2015.html