Problem showing in PDF- Template Module (SuiteCRM 8 Version )

I have created a template in the PDF module.
Template created successfully, but when I add “footer” for HTML Coding, the 'Update" option get disappears.

Missign header

Missing Footer also

<!DOCTYPE html>
.all-browsers {
  margin: 0;
  padding: 5px;
  background-color: lightgray;

.all-browsers > h1, .browser {
  margin: 10px;
  padding: 5px;

.browser {
  background: white;

.browser > h2, p {
  margin: 4px;
  font-size: 90%;

footer {
  text-align: center;
  padding: 3px;
  background-color: DarkSalmon;
  color: white;

  <p>Author: Hege Refsnes<br>
  <a href=""></a></p>


Please suggest…

Is there any way to directly share the PDF file with another client?