app/views/sequence_relationships/batch_load/primers/_form.html.erb
<%= form_tag url, multipart: true do -%>
<div class="field">
<%= label_tag :file, 'Select a file' -%>
<br>
<%= file_field_tag :file -%>
</div>
<% if @result -%>
<% end %>
<%= content_for :warn_level -%>
<%= submit_tag submit -%>
<% end %>