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Which option in the built-in firewall in System Preferences needs to be enabled to allow AirDrop to receive files on a Mac?
The Mac can currently see iPhone's and other devices in Airdrop, but does not show on the iPhone as a target for Airdrop.
Open System Preferences -> Security & Privacy -> Firewall
Select Firewall Options
In the list set "sharingd" to "Allow Incoming Connections"
Alternatively, tick "Automatically allow built-in software to receive incoming connections"