Over the past 2 years I have tried the following methods: 1. Connect usb cable, HTC app worked for a while but then failed to work. 2. Used Android file transfer app. Again, worked for a while but then stopped working. 3. Verizon recommended the Airdroid app. It transferred the photos but compressed them which greatly lowered the picture quality. The iMac runs OS 10.9.4 and is fully updated. I also tried with my LG G2 and failed. So, I am starting to think Android phones are simply not designed to work with iMac computers. Because all of the workarounds I have tried failed. This is for my wife who is a Mac user, fyi. I will stick with my Android phone regardless because I have no trouble transferring pictures to my Windows 7 and 8 computers. Android phones work with Windows PC's the way I expect: you simply plug into USB and an icon opens under "my computer". You then browse the files just like you would with a usb flash drive. Simple and the way it should be.