Lightroom 5.4.1 for iOS and iPadOS is now available

The 5.4.1 update is available for Lightroom for iOS & iPadOS

Adobe has rolled out version 5.4.1 of Lightroom mobile for iOS and iPadOS to address issues introduced in 5.4.0.

New camera support, additional language support, and other fixes introduced in 5.4.0 will be restored in the next Lightroom mobile release.

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