Automatically replace new versions of Images ?

Hi, when i make changes to images that are already in the slideshow, and overwrite those files, those changes do not make it into the slideshow. Looks like in Fotomagico there is no connection to the image file, instead Fotomagico copies them, and does not notice changes.
What would be a way to automatically overwirte the images in the slideshow with the new exoported versions?
thanks guys!!