You can supply a short message to the uploader explaining why you rejected this upload.

<%= edit_form_for(PostDisapproval.new, url: post_disapprovals_path, remote: true, html: { id: "detailed-rejection-form" }) do |f| %> <%= f.hidden_field :post_id, value: "x" %> <%= f.input :reason, collection: PostDisapproval::REASONS.map { |x| [x.humanize, x] } %> <%= f.input :message, as: :string %> <% end %>