Hello Gem,
Gad to know that you liked the plugin.
We’re striving hard to make it the best Woocommerce Product Addons with multiple types of custom fields to add extra product options and it’s really encouraging to know that you’re loving some of its features.
We’ve releasing a Premium version of this Plugin soon, probably by next week itself, and feature to enable customers to upload files such as docs, images etc along with their order will be available in the same. We could let you know when it’s released so you can have a look, if you wish to.