redmine/app/views/common/_other.html.erb

<% download_link = nil unless defined? download_link %>
<% kind = nil unless defined? kind %>
<% path = nil unless defined? path %>

<% if path.present? %>

  <% if kind == 'video' %>
    <%= content_tag :video, class: 'filecontent', src: path, controls: true do %>
      <%= render partial: 'common/no_preview', locals: { download_link: download_link } %>
    <% end %>
  <% elsif kind == 'audio' %>
    <%= content_tag :audio, class: 'filecontent', src: path, controls: true do %>
      <%= render partial: 'common/no_preview', locals: { download_link: download_link } %>
    <% end %>
  <% else %>
    <%= render partial: 'common/no_preview', locals: { download_link: download_link } %>
   <% end %>

<% else %>

  <%= render partial: 'common/no_preview', locals: { download_link: download_link } %>

<% end %>