i want to have the customer upload a doctors prescription before he/she checkouts, can this be done?
If you are talking about the Wix Stores Checkout Page, then you can change it as stated on the Wix Stores own support pages.
https://support.wix.com/en/article/customizing-your-wix-stores-checkout-page
Plus, you might want to vote for this feature here too.
https://support.wix.com/en/article/request-adding-an-upload-file-option-to-your-product-page
thanks for replying, can i enable that one field via code. i want to check if the customer has added some items to the cart which needs prescription, then i enable that field and make it mandatory also.