Wont work with existing pictures.
I bought this, wanting to merge some pictures I had already taken with another camera using exposure bracketing, but this app apparently only works with pictures taken within the app. A big letdown. Wish I had known this since I have many other apps that can already do what this one does. If it ever supports camera roll pictures for creating HDR, I will up my review rating.
xdacy about
Fusion - HDR Camera, v1.2.4