Use of WMD with iphone 5s

WMD is not meant for general iPhone backup.  You should be able to transfer photos and videos, though.  Go into the app on your iPhone, tap “Photos”, then at the bottom of the screen, select “iPhone”.  Now, you should be able to navigate to your camera roll, select photos, then tap the icon at the bottom which gives you choices of what to do with the selection(s).  One option is “Save to Media Drive”.