The default for a listing template is to use All the Images for each of the variations and upload them . This means for example a listing of 6 variants each with 3 pictures you would have 18 images all repeats of the same 3 images . To address that you have to go into each listing and deselect duplicate images . Would be great to have option to set "Only use Main Variation Images" or similar .at Configurator level.
This seems to be a feature already completed for ebay.