Luma Ray3 HDR is only supported in the Android app at this time.
On the homescreen, tap Text to image or Image to video.
In the Generate video screen, enter a text prompt for the video you want to generate.
To set an image as the starting point of your video, upload it as the first frame in the Frame section. To end your video with a specific image, upload it as the end frame.
Tap General and then Partner models to view the list of partner models. Select Ray3 or Ray3 HDR.
Tap the Generate icon to generate the video.