After testing the feature for about a month, Twitter announced that everyone will now have the option to upload and view 4K images on Android and iOS. To start uploading and viewing images in 4K, Twitter said you need to update your high-quality image preferences in your “Data usage” settings.

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Twitter has become a great platform for sharing high-resolution images. The service previously introduced support for 4K images on its web app, allowing photographers to share images in high-resolution format. Bringing the same feature to mobile means you can view and upload high-quality photos from anywhere.
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In the “Data usage” menu, you can choose how high-quality images are downloaded and displayed on your device. You have the following options: “over cellular or Wi-Fi,” “Over Wi-Fi only,” or “Never.” The same applies to the auto-play high-quality video options.
Twitter began testing 4K image viewing and uploading on mobile in early March alongside another feature that improved the way images are cropped on the platform. The improved image cropping isn't widely available to everyone — at least not yet.
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With the ability to view and upload 4K content, Twitter has become one of the best platforms for sharing work (photos, illustrations or drawings). Twitter has become more than just a platform to share your thoughts. Try the new ability to view and upload 4K images, if available on your mobile device.
Information source: xda-developers.com
