I've installed the most current driver, but it's not showing up under devices when using the supplied USB data/charging cable...any ideas? thx
Try unlocking your developer options and turning on usb debugging. See if the Mac recognizes the phone that way.
Go to settings, about phone, software info, tap on build number until it says the options are unlocked. Back out and go on to the developer options and check USB debugging. Make sure you are not plugged in to the Mac yet.
Current devices: T-Mobile G4, Surface Pro 3 Core I5, and Moto 360
Past Devices - Phones: Galaxy S6, Galaxy Note 4, Nexus 6, Nexus 5, Galaxy Nexus, Nexus S, Galaxy Note 3, Galaxy Note 2, Galaxy S5, Galaxy S4, Galaxy S3, Galaxy S2, HTC Incredible, HTC EVO 4G, HTC EVO, HTC Hero, Motorola Photon.
Tablets: Nexus 7 (2013), Nexus 7 (2012), Lenovo Yoga Tablet 2 Windows 8.1, Dell Venue 8, Galaxy Tab Pro, Galaxy Note 10.1 2014 Edition, Galaxy Note 10.1, Galaxy Note 8, Kindle Fire HD 8.4, Kindle Fire HD 7, Kindle Fire, iPad 2, iPad 1, Nook HD, Nook.