The External Submission functionality only submits information to an external service. An External Submission acts in the same manner as a standard form, except that data is also sent to an external service when the form is submitted.
Important Note:
Ensure to Enable the External Integration so the External Submission option is available.
Who can use this feature?
System Administrator | Owner | Publisher | Author
Note:
Authors can only edit draft forms and cannot publish forms.
Instructions
Navigate to Modules > Content > Form Center
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Select the category that you want the form to be in
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Either Create a New Form or Modify an Existing Form
In the form, select the External Submission Type

Add the URL

Select Save or Save and Publish
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Save: Saves changes
Save and Publish: Saves changes and publishes to live site