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Google translation: "Reading SD & XQD cards on macbook Pro. Lightroom displays an empty preview page when I want to import content from an SD or XQD card from my Nikon D500. The content of each preview is: "preview not available for this file" below the photo number. I can blind import the photos or copy with the finder to a temporary directory on the desktop for Lightroom to read. A solution ?"
Normally, it's best to import from cards via the Files (Fichiers) section rather than Devices (Appareils) -- it's much faster and more reliable:
But nothing is appearing under NIKON D500 in your Files section.
Are you connecting to the camera with a USB cable? If so, use a card reader instead.
If you are using a card reader, make sure you've granted LR Full Disk Access: