separate content validation content

Author: rchinn1

src/engage/content/email/editor.md

@@ -149,6 +149,10 @@ For example, use  `{% if %}`, `{% elseif %}`, and `{% else %}` tags to call a pr
 
 To view more examples related to your use case, visit the [LiquidJS docs](https://liquidjs.com/tags/if.html){:target="blank"}.
 
+## Content validation
+
+For all content editors in Engage, you'll see alerts for any issues in your template, such as invalid profile traits or incorrect [liquid syntax](https://liquidjs.com/tags/overview.html){:target="blank"}. Engage both flags template issue(s), and displays recommended next steps. While you can save these templates, you must fix any issues before using them in Engage campaigns. 
+
 ## Save the template
 
 After you design the email, click **Create Email Template**.

src/engage/content/email/html-editor.md

@@ -55,10 +55,12 @@ Click **Format** at any time to properly indent and format your code in the HTML
 > info ""
 > When you toggle from the HTML editor to the visual editor, Engage may make minor changes to your code formatting. If Engage re-formats your code, it will not affect the email layout.
 
-### Error flagging
+### Error flagging and content validation
 
 Engage displays in-line error flags in the code editor to help you debug your code. If there are errors, you might not see content as expected in the preview screen until you've debugged your code.
 
+For all content editors in Engage, you'll see alerts for any issues in your template, such as invalid profile traits or incorrect [liquid syntax](https://liquidjs.com/tags/overview.html){:target="blank"}. Engage both flags template issue(s), and displays recommended next steps. While you can save these templates, you must fix any issues before using them in Engage campaigns. 
+
 ## Personalize with merge tags 
 Add merge tags to personalize your message with user profile traits.
 

src/engage/content/email/template.md

@@ -32,6 +32,9 @@ To configure an email template, click **Create Template**.
   - [**HTML Editor**](/docs/engage/content/email/html-editor/) contains both a code and visual editor from a single view. This editor provides complete HTML editing access with error flagging.
 4. Design the email template, then click **Create Email Template**.
 
+> info "Engage content validation"
+> For all content editors in Engage, you'll see alerts for any issues in your template, such as invalid profile traits or incorrect liquid syntax. Engage both flags template issue(s), and displays recommended next steps. While you can save these templates, you must fix any issues before using them in Engage campaigns. 
+
 ## Test the Email template
 You can send test emails before you include a template in marketing campaigns.
 
@@ -45,6 +48,11 @@ You can send test emails before you include a template in marketing campaigns.
 5. Select **Send test email**.
 
 > success ""
+> When you send a test message, the trait must be valid for the field it's being used in. For example:
+> - If you use `profile.traits.first_name` in the **From sender** field, it must be a valid username. 
+> - If you use `profile.traits.email` in the **Reply to email** field, it must be a valid email address.
+
+> info ""
 > You can also test email templates directly from a [Send an Email step](/docs/engage/journeys/build-journey/#send-an-email) in Journeys.
 
 ## Personalize with merge tags

src/engage/content/sms/template.md

@@ -34,6 +34,9 @@ Follow these steps to build an SMS template:
 
 Use the SMS Templates screen to preview and update existing SMS message templates.
 
+> info "Engage content validation"
+> For all content editors in Engage, you'll see alerts for any issues in your template, such as invalid profile traits or incorrect [liquid syntax](https://liquidjs.com/tags/overview.html){:target="blank"}. Engage both flags template issue(s), and displays recommended next steps. While you can save these templates, you must fix any issues before using them in Engage campaigns. 
+
 ## Test your SMS template
 
 Send a test SMS message before you include it as a step in your Journey.