Uploading 1 file per product.

Hi, am using your plugin, and i wanna know why when i select an item twice, am now able to upload 1 file for each. Like for example, when am choosing 2 different products, i can upload 1 file for each product, but when it’s 2 of the same product, i can upload only 1 file, s it possible for you to resolve this, so that my customer can upload 2 different file even if they are purchasing 2 same product.

Thank you

https://wordpress.org/plugins/woocommerce-upload-my-file/