Over the last few years, we’ve rolled out tools to encourage advertisers to use HTML5, so you can reach the widest possible audience across screens (http://goo.gl/nWHctK). To enhance the browsing experience for more people on more devices, the Google Display Network and DoubleClick Digital Marketing are now going 100% HTML5.
● Starting June 30th, 2016, display ads built in Flash can no longer be uploaded into AdWords and DoubleClick Digital Marketing.
● Starting January 2nd, 2017, display ads in the Flash format can no longer run on the Google Display Network or through DoubleClick.
You can hit the link below for help on transitioning your ads to HTML5. At this time, video ads are not impacted by the change.