AirDrop
Will my iMac support airdrop to my iPhone 6 . iMac 27 inch mid 2010 with Yosemite 10.10.4. Neither device becomes discoverable on the other. Is it the blue tooth and can this be upgraded on the iMac?
Please look over Use AirDrop to send files from your Mac to another nearby Mac or iOS device - Apple Support, this should answer all of your questions.