I want to import photos from my SD card without having to actually copy the file to my mac's hard drive.
So I want to ADD this files instead of copying them bu the ADD button is grayed out. I tried formatting the SD card to my mac (FAT 32) and it still doesn't work.
How can I ADD images from my sd card in lightroom?
Lightroom is protecting you from losing your original files, because it is so easy to format the SD card in a camera- you lose the lot!!, and the SD card would need to be always plugged into the computer for Lr to have access to the 'originals' when developing or exporting derivatives.
You must copy the photos to an internal or connected external drive.