How to load images from PC to iOS 8 iPhone camera roll?
I recommend trying Dropbox or Cubby. I know Dropbox allows roughly 3GB (I think) for free and depending on the size of your photographs that may be enough. 

All you do is login online and upload the photos to Dropbox (note that Cubby is comparable in nearly all aspects) and then install the app on your phone. You can then save the images to your camera roll. 

Note that if you use Backblaze (if you don't now perhaps you should anyway), you can simply download the images from your app on your phone.