Embedded image link not appearing in iOS, but does on web and mobile web views

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#1

Example tweet: https://twitter.com/_testing/status/984472289638010881

The tweet has a pic.twitter.com URL in the tweet text and an image preview appears in the web and mobile web views. However, if you view that tweet in the iOS Twitter app, it doesn’t show the image inline. Any ideas why that would be the case?

Thanks for your help.