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How to avoid importing doubles. I import my photos from sd-card, everytime I've had a shooting, but afterwards I don't delete this imported photos on my sd-card. So, i've much photos as _A7403(001), _A7403(002), etc ...
In V5 there is an option on the import settings, in the "copy images to new location" section, called "duplicate handling" with options of "skip file", "overwrite file", "make name unique". But PSU will normally remember which images you have already imported and will not re-mark these for import unless you mark them yourself.