How to share a folder of photos with someone who doesn't have the WD software?

Yes, you can do this, you will have to go into your security, firewall, and make sure Port 80 is checked, see image below. After I did this my brother and his wife were able to open up a short video I sent to them and watch it. I was able to open up a photo and a very small video (1.3 MB’s) on my old Apple computer connected by phone line.