If you have imported all of the image data via CSV, then you can FTP the images directly on to the server. Make sure that path you're using in the CSV is the full URL for your store.
Here's a great post on this issue direct from the PrestaShop forums:
PrestaShop forum issue - Bulk Products and Image Import
If you have any further questions, please contact technical support or leave a comment at the bottom of the page.
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