Thanks BN.
Yes, I'm using Photos 1.5 (370.42.0)
It's a late 2009 iMac with 8G of memory running El Capitan OS 10.11.6.
The iPhone is a 6 with OS version 9.2.1 (13D15) and has not yet been upgraded to 9.3.4
If you could give me some basic instruction on how to Airdrop across, I would greatly appreciate it.