Ok, now I get it. So it is the SD card for sure. I had no idea a flash drive and SD card were different animals. But if it's the SD card that fits next to the HDMI port, then that's what I'm getting as I never use that port.
The SD card it is.
And you'll need this guy with your next Mac:
https://www.apple.com/shop/product/...3137712f7caa748b8a814850f047de6e5305e7d1 USB-C to SD Card Reader - Apple