WTF, Apple? Today, on a 2015 21.5-inch iMac running High Sierra, I was able to share photos from a Windows Phone over Bluetooth, yet at home, the same phone can't send files to either my 2017 iMac or 2014 MacBook Air (both also with High Sierra).
I get an error message that the Bluetooth file sharing feature is not supported.
#Bonkers.