WordPress Product Form Enhancer Plugin

I need a custom WordPress plugin that extends the standard product form with three key capabilities: extra custom-defined fields, flexible conditional logic that shows or hides inputs based on prior selections, and secure file-upload handling. The solution must integrate cleanly with my current theme and WooCommerce setup, respecting existing styling while remaining portable to future themes.

I will provide the exact field names, logic rules, and any design mock-ups as soon as we start. Code quality matters—please follow WordPress coding standards, keep everything translatable, and avoid hard-coding text. A lightweight approach with no unnecessary dependencies is preferred.

Deliverables
• Installable plugin (.zip) with all source files
• Clear setup & usage documentation (Markdown is fine)
• Brief screencast or screenshots proving the features in action

Once the plugin is installed and I can reproduce the field display rules, upload a file successfully, and see the data in the order details, the job is complete.