How do I export photos from my iPhone 6 to my Western Digital external hard drive for backup copies? How do I export photos from my iPhone 6 to my Western Digital external hard drive using my Mac? I need to clear up space on my phone already and can't believe how frustrating it is trying to figure this out.
Open /Applications/Image Capture.app, select your iPhone, then select your WD as the destination.

Then use Image Capture's delete button to erase all the photos from your phone.