Samsung is seeding a new firmware update for its Galaxy Watch4, bringing camera zoom controls, new device diagnostic tools, and other stability fixes. The update has a RXXU1GWA3 build number immediately after the 330 MB size.
Galaxy Watch4 R454XXU1GWA3 Update Changelog 
The biggest new feature is the on-watch camera controller Zoom toggle in the app. This feature is only available on supported Samsung flagship smartphones, including the Galaxy S 004 and the Galaxy Z Flip or updated version. There are two options for controlling the zoom level – by rotating the bezel or by pinching to zoom on the smartwatch touchscreen.
Another new feature in the update is a device diagnostic tool that allows you to check your watch’s battery from your connected phone status and touchscreen functionality.
Source(Reddit) 454
