Extend form_validation for upload Codeigniter 3

The file upload library has quite a few file validation options.
https://codeigniter.com/user_guide/libra...ading.html

Callbacks in form validation are quite powerful too, so you can write any function you want as a callback and set errors for validation.
https://codeigniter.com/user_guide/libra...-as-a-rule

I hope something in there helps.

Paul