Here is the Adobe help for 'importing' or transferring iPhone Camera Roll photos to the Lightroom eco system.

Now, when you shoot with Lightroom’s camera, those raw images will appear right within Lightroom, ready for you to edit on your Phone. As explained by Jim- The iPhone camera and the Lightroom camera are two different systems, and only the Lightroom camera automatically syncs to Lr-Classic catalog. Tap on the name, and a pop-up screen appears where you can choose which mode you want to shoot in. STEP TWO: Up at the top center of the screen, it shows the file format you’re shooting in (shown circled above in red) – either JPG (jpeg) or DNG (Adobe’s RAW format). You can control exposure, contrast, highlights, shadows. STEP ONE: Launch Lightroom on your iPhone, and at the bottom of the main street, down at the bottom in the blue pill shape click on the Camera icon to bring up the Camera app. Lightroom for mobile doesn’t skimp out when it comes to editing capabilities, and this mobile app competes against full desktop software. You don’t need a brand new iPhone 14 Pro to shoot in Raw – as long as you have an iPhone made in the last eight years (at least an iPhone 6s, 6s Plus, or SE, all of which came out in 2014), or newer, you can use Lightroom’s awesome built-in camera to shoot in RAW mode (It was IOS 10 that let 3rd party apps like Lightroom on your iPhone shoot in Raw, even though Apple’s own Camera app didn’t include that option).

Lightroom for iphone