how to add files for product option

-- HikaShop version -- : 2.5.0
-- Joomla version -- : 3

currently I am selling images in my site is that posible to assign download files for various product options (i.e small,medium,large wil be the product option if users select small they should download the file assign to it)

Hi,

Yes. When you edit your product, you have a "variants" tab where you can edit each variant of the product (the small, medium, large, etc). In each one, you'll find an upload area where you can assign a file to be available after the purchase of the variant.