lib/ui_bibz/ui/core/forms/files/file_field.rb
def pre_render
      content_tag :div, html_options do
        concat file_field_tag content, class: "custom-file-input" , multiple: options[:multiple], disabled: is_disabled?
        concat label_tag label_name, label_content, class: 'custom-file-label'
      end
    end
def pre_render
      content_tag :div, html_options do
        concat file_field_tag content, class: "custom-file-input" , multiple: options[:multiple], disabled: is_disabled?
        concat label_tag label_name, label_content, class: 'custom-file-label'
      end
    end
See UiBibz::Ui::Core::Component.initialize
 Render html tag