Fix for Airdrop stuck on waiting

Hello all, this is not so much a question as a solution.

The problem I solved is as follows: my iPhone and iPad saw my MacBook Pro (2021, M1) when trying to Airdrop photos to the MacBook, but the operation was stuck on 'waiting.'

After attempting several fixes, I found that my firewall settings were blocking all incoming connections using built in apps; alternatively, I could have only selected "sharingd" from the connections I wanted to allow, and supposedly this would have worked as well.

After allowing built in apps to accept incoming connections, Airdrop once again functioned perfectly.