A few ways to do this. You could go into your library, double-click on the
existing photos, then click on "Import", find your files, click OK. Then, if
you have not done so already, you might have to deal with getting the sizing
correct. The best bet might be measuring the existing photos, then going
into Photoshop, setting the crop tool to those exact specs, cropping,
importing, etc..c
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:confused;