Hello Michael,
Thank you for your post.
Currently the Store Manager does not allow to import a virtual product with the file, however you're welcome to submit a request at:
http://prestashop-manager.betaeasy.com/ and we will consider it in future.
Concerning product images. You see, PrestaShop shopping cart uses a specific storage system which uploads product images to the specific folders at store root/img/p/x/x...
Store Manager for PrestaShop allows to import product images that are located at the local folder or at the external source (URL is required).
You're welcome to find a detailed instructions on how to import product images in the articles below:
http://store-manager-for-prestashop-documentation.emagicone.com/how-to/upload-images-while-importing-products
http://store-manager-for-prestashop-documentation.emagicone.com/how-to/upload-images-from-external-urls-while-import
Feel free to contact us with additional questions.