SD Card not showing in Sidebar (Big Sur, multiple computers)
https://support.apple.com/guide/mac-help/use-an-sd-or-sdxc-card-mh28068/mac
This Apple Support (for Big Sur) page says, "Eject an SD card: In the sidebar of a Finder window, select the card, then choose File > Eject. After the card’s icon disappears from the sidebar, remove the card from the slot."
SD cards do not appear in the sidebar on either my iMac or my MacBook Pro. How do I make them show up?