# Email templates: FAQs

<Expandable title="What happens if a variable has no value?">

If a variable is empty, it will appear as blank in the email.

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<Expandable title="Can I edit an email template after it’s used in a workflow?">

Yes, but changes will only apply to future sends. Emails that were already sent will not be updated.

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<Expandable title="Why can’t I select my email template in the workflow?">

Make sure the email template you created has been **activated**.\
Only active (published) email templates can be selected in a workflow.

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<Expandable title="Why is my email not being sent?">

Check the following:

* The workflow is **published**, not in draft mode.
* The trigger conditions are met.
* The recipient has a valid email address.
* The email template is active.

You can also review the workflow run history for errors.

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<Expandable title="What is the difference between system variables and custom variables?">

* **System variables** automatically pull data (e.g., customer name, email, order details).
* **Custom variables** must be manually defined in the workflow and passed into the template.

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<Expandable title="Can I use variables in buttons and links?">

* No. Variables are currently not supported in buttons or link URLs.

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<Expandable title="Can I schedule emails or manually send emails using templates?">

Email templates cannot be sent or scheduled on their own.

To send an email template, you must:

* Add it to a **workflow** (for automated emails triggered by events).
* Use that workflow in a **campaign.**

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<Expandable title="Can multiple workflows use the same email template?">

Yes. A single email template can be used in multiple workflows or campaigns.\
However, changes to the template will impact all future sends across those workflows.

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