How can I change alts and titles of images in photo gallery generator?

Q: I have just bought the full version, it's pretty slick and very easy to embed into a site.

One minor issue is that I cannot see how to set the alt img text for each main image. I can do this manually in the html but would be much better if I could set via the program, the same way as setting the caption ?

A: Alts and titles are file names of your images.