https://wccftech.com/twitter-for-ios-and-android-now-lets-you-upload-4k-images-heres-how-to-enable-it/

Good news, Twitter folks. You can use the official Twitter app for iOS and Android to upload 4K resolution images.

Twitter has come a long way when it comes to sharing photos and videos. From ditching TwitPic in favor of its very-own, native imaging service, we are now seeing the company taking things further by enabling 4K image uploads across both iOS and Android.