I've been trying to sync Photos from my iPhone 5S to my rMBP. I connect with an Apple-branded 3 foot Lightning cable, and I'm able to sync to iTunes with the cable, but Photos for whatever reason is not acknowledging that my iPhone is plugged in.
Therefore, I don't get the additional Import button on the top of the Photos window. What steps can I take to resolve this problem?
Note: rMBP running El Capitan beta build 15A278b and iPhone 5S running iOS 9.2.