Twitter tests 4K image uploads, full view photos in tweets
Twitter is testing new media features on its Android and iOS apps. The new features make it possible to see the full image on your Twitter timeline, and also support for 4K images.
Twitter Support announced the new features saying that it will be testing them over the next few weeks. Twitter is making it possible for images to appear in full view, and not in half like it does presently. So the image you tweeted will look exactly like how it does in the tweet composer. At present, you need to tap on the tweet to see the full image as it shows only a preview of it on the timeline.