The first step is to open Terminal found in Finder -> Applications -> Utilities.

You have to enable hidden files, which is not a difficult task.

Sometimes, files on your memory card will be hidden, and cannot be seen on a Mac computer. If yes, then there could have been issues with the card reader. Use another card reader and see if you are able to see the pictures on Mac.

Directly recover Photos from SD card that is not showing on Mac.

Here are few quick ways that you can follow to recover photos from SD card that is not showing on the Mac. Try out these fixes and see if photos are showing up on your computer. Every problem has a solution, and like that here's an easy solution for your problem. However, here's a solution to fix the issue and recover deleted files from the SD card that is not showing on the computer. But the same SD card when inserted to your camera or phone, shows all your pictures stored in it. It may show as empty without showing any files stored in the card. Sometimes, it happens that the photos saved on your SD card when connected to your computer that won't show up.

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Macbook sd card holder