CI3 Multiple file upload: Custom error message ($this->upload->display_errors())

GG. Also, I did a pull request on CodeIgniter's github repo: https://github.com/bcit-ci/CodeIgniter/pull/3797. Hope it will get approved. If not, you can at any time change the system files yourself, although I won't encourage you to do that...

Thanks for pointing me the files from the /system. but, yeah its not wise to touch the core. i hope your pull request granted. if i don't see any other way, i maybe force to slightly modify the core files in the system.

Thanks again!