i'm using LR 3 updated my IMac to EL Captain and my camera is a Nikon D700. Before the update I plug in my camera and LR 3 would upload pictrues. After update plug in camera and it goes to photo on the IMac not in LR 3. Carisa
Photos App is the default photo editor application on Mac El Capitan and you need to turn off auto import in Photos App so that you can directly import your raw images to Lightroom.
Refer the instructions in this article to disable auto-import in Photos App : How to Stop Photos Opening Automatically on Mac OS X when iPhone or Camera Connects