I found a good general article on this:
http://support.fotomoto.com/customer/po ... ked-images
My experience with Fotomoto is limited, but currently it works like this - The images in your Imagevue gallery are automatically added and referenced from Imagevue to Fotomoto. When visitor clicks to purchase an image, they will see a copy/reference of the image you have in Imagevue (therefore watermarked). However, when they choose to proceed with a purchase, they are not in fact purchasing a print(or download) from this exact image. There are two scenarios:
1) Unless you have taken action with HQ photos, then you will be prompted by email from Fotomoto to provide a HQ version of the image that has been purchased. They will then proceed to create the print, or provide the download of the HQ version to the customer.
http://support.fotomoto.com/customer/po ... eady-files
http://support.fotomoto.com/customer/po ... for-print-
2) You can tell fotomoto where you have HQ versions of your images stored, so that they can proceed with providing the product to customer without requesting the HQ version from you first. You can set up auto-pickup:
http://support.fotomoto.com/customer/po ... omatically
However though, the Fotomoto interface will still only use the smaller preview image (watermarked) for the purchase interface. Why would it load a 4000px HQ image just for the small sales interface? I guess your issue is that you don't want the watermark in the sales-interface? Then I would need to question why you are using watermarking at all for your low-resolution photos ... If the visitor can access a non-watermarked version of your image by clicking the fotomoto buy-button, then your watermarks don't really have any effect.
As explained above, Fotomoto will use a HQ version to send to your customers.