When we update the existing template code, a new template version will be created. All signatures currently using the updated template will not see the changes, until you manually update them to use the new version.
In the template detail page, you will see a breakdown of all signatures using a given template and whether or not they are using the latest version. If there are any signatures using an outdated version, you will be prompted to update them by clicking on the Update signatures button that will appear next to each template’s name.
After updating signatures with new templates, the signature code will be changed. Repeat inserting signatures to your email client to use the latest signature.