How to Turn on Airdrop on Mac Computer
Sometimes AirDrop acts shy. If you don't see your friend's device, double-check that yours is set to "Everyone" temporarily. Also, make sure both devices are awake and unlocked. A sleeping Mac is like a closed door—AirDrop can't knock.
Still nothing? Go to your Mac's System Settings (from the Apple menu), click "General," then "AirDrop & Handoff." Toggle AirDrop off and back on. It's the classic "turn it off and on again" trick, and it works more often than you'd think.
If all else fails, restart your Mac. I know, it's a cliché fix, but it's like giving your computer a quick nap. When it wakes up, AirDrop usually works perfectly.