Why is my HTML email template not working properly?

This issue usually occurs because the HTML code contains unsupported elements such as iframe or embed tags. Email editors and most email clients do not support these elements due to security and compatibility limitations.
When the template is saved, unsupported tags are automatically removed, which may cause parts of the design to not display or appear blank. This behavior is expected and not an error.

Use email-compatible HTML elements such as images and tables instead of iframe or embedded content.