Install for Messages in iCloud
Apple stripped Messages in Cloud from the iOS 11.3 update, but the feature's returned in iOS 11.4 beta.
For those that don't remember, Messages in Cloud was included in iOS 11 beta up until the release of iOS 11 beta 5. The feature vanished in the fifth beta and Apple promised to deliver it in a future iOS 11 update. It looks like that update will be iOS 11.4.
Messages in iCloud is a huge addition for a lot of iPhone and iPad users because it allows iMessages to be stored in the cloud.
Messages can take up a ton of room on internal storage so this will allow you to quickly, and easily, free up storage space. It also allows users to save messages that might get deleted otherwise.
It's available in the beta and it'll hopefully make it into the final release. Fingers crossed.