The 5.4.2 update is available for Lightroom for iOS & iPadOS
What's in the 5.4.2 update?
• Vietnamese and Polish language support: Xin chào to our Vietnamese speakers and dzień dobry to our Polish speakers!
• Fixed missing noise reduction bug when exporting for Largest Available Dimension
• Support for the latest cameras and lenses found in the Adobe Camera Raw 12.4 release (the full list of supported cameras and lenses can be found at http://www.adobe.com/go/supported_cameras
• Other bug fixes and stability improvements
Update Lightroom on your mobile device via the AppStore (iOS/iPadOS)
Get Started with Lightroom CC on a mobile device
Please have a look here for more information: https://helpx.adobe.com/lightroom-cc/using/whats-new.html