<%= render partial: 'form', locals: { edition: @edition, attachment: @attachment, url: admin_edition_attachment_path(@edition, @attachment) } %>

<% page_title 'Edit attachment' %>

<div class="span6">
  <section>
		<h1>Editing attachment: <%= @attachment.title %></h1>

		<%= render partial: 'form', locals: { edition: @edition, attachment: @attachment, url: admin_edition_attachment_path(@edition, @attachment) } %>
	</section>
</div>

Tweak markup for attachments edit
Tweak markup for attachments edit
