So how does this flatten file actually work in practice. Let me see if I can ask this correctly. If I save a file with all its associated layers etc as a "base file" (one with all elements intact) and then flatten it. Say I work on the flattened image but I need to correct something or modify the base file, I then loose all the work placed on the flattened image, so what's the advantage? I understand flattening and lowering resolution for finished product but I really don't have a handle on it for in progress work. Anyone care to explain that a bit more? Jax I get the idea of multiple file save increments