The updated Bing Ads app now allows advertisers to edit expanded text ads on the go. It does not appear that new expanded text ads can be created via the app, the update only supports editing of existing ads.
Here’s what the interface looks like:
Additionally, expanded text ads can be edited and/or created through desktop clients such as Bing Ads, Bing Ads Editor, and Bing Ads API.
Today’s update is available on both the iOS and Android versions of the Bing Ads app. For further assistance with expanded text ads, please read: 5 Ways to Improve Your Expanded Text Ads Now.