Application_Form/app/views/email/add_file_email.html.erb

<% email_set = ApplicationFormMain.where(id:@data['application_form_id']).first.application_form_email_sets.select{|v| v.field_name == 'add_file'} %>
<% if email_set.length != 0 %>
	<% if !(email_set[0].content.nil?) %>
		<%= email_set[0].content[@data['locale']].html_safe %>
	<% end %>
<% else %>
	<%= t('application_form.email_add_file_content') %>
<% end %>