A specific error occurs when an attempt to update an email template exceeds the maximum allowed payload size of 1,048,576 bytes (1MB):

Payload content length greater than maximum allowed: 1048576

This article explains the size limitations for email templates and provides an alternative solution using a custom email provider Action for complex localization requirements.

• Email templates
• Localization
• Custom email provider Action

To manage email template sizes and localization, follow these steps:

1. Maintain the email template below 1 MB to avoid payload errors. 
2. If the required localization exceeds the size limit, implement a custom email provider Action.
3. Configure the Action to send the following attributes to an external Application Programming Interface (API) for translation:
   • event.notification.message_type
   • event.notification.html
   • event.notification.text
4. Return the translated content to the Action before final delivery.