One way you might work around this, which actually gets you more useful customer data in the process, is to have them "order" the mockup.
ie:
- set up an Option Name "Artwork", with type set to "File"
- create a product in your store named "Free Artwork Sample"
- add a new attribute to your Free Artwork Sample product, using the Artwork option from the list. Leave all the other options set to defaults EXCEPT mark it as a Required item.
Now tell customers to Add that product to their cart, and complete checkout. While adding to their cart, they'll be given the option to upload artwork.
Now, since you've collected all their contact information during the checkout, you'll be able to consult with them more easily if you need to do follow-up, ask questions about their wishes when making mockups, etc.
The file they upload will be stored in the /images/uploads folder, and the filename will be listed in your Zen Cart admin as part of the order details.
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