Cannot flatten composite layers
I spend ages making a selection with select subject, then select and mask, clean up around it amd then try to flatten the composite. However it does not allow that option. If I save without flattening all the work is lost - even why I do it as a PNG. I have watched all the tutorials I can find but they all seem to end just before this crucial final stage. I am sure I am just missing one simple stage but I am at a loss to know what it is.
