openproject/app/views/attachments/_form.html.erb

<%#-- copyright
OpenProject is a project management system.
Copyright (C) 2012-2017 the OpenProject Foundation (OPF)

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License version 3.

OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
Copyright (C) 2006-2017 Jean-Philippe Lang
Copyright (C) 2010-2013 the ChiliProject Team

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

See doc/COPYRIGHT.rdoc for more details.

++#%>

<fieldset class="form--fieldset">
  <legend class="form--fieldset-legend">
    <%= l(:label_attachment_plural) %>
  </legend>
  <div id="attachments_fields">
    <div class="grid-block" id="attachment_template">
      <div class="form--field">
        <div class="attachment_field form--field-container -vertical -shrink">
          <div class="form--file-container">
            <%= file_field_tag 'attachments[1][file]', size: 15, id: nil, class: "attachment_choose_file"  -%>
          </div>
        </div>
      </div>
      <div class="form--field">
        <label class="form--label">
          <%= l(:label_optional_description) %>
        </label>
        <div class="form--text-field-container">
          <%= text_field_tag 'attachments[1][description]', '', size: 38, id: nil %>
        </div>
      </div>
    </div>
  </div>
  <span class="add_another_file">
    <%= link_to l(:label_add_another_file), '#', onclick: 'addFileField(); return false;' %>
    (<%= l(:label_max_size) %>: <%= number_to_human_size(Setting.attachment_max_size.to_i.kilobytes) %>)
  </span>
</fieldset>