Looks like AirDrop broke with the latest macOS upgrade. I'd never used the Image Capture app on the Mac to drag & drop files from my iPhone to my Mac, but this is a temporary quick fix when attaching a USB-C cable.
@gallaugher I thought AirDrop has always been periodically broken.😏
Reboot both sides - twice, change allowed to “Everyone” and back to “Contacts" , turn bluetooth off and on again (make sure you have a wired mouse if it's a desktop), do a special dance ... suddenly AirDrop will start working again.
