Importing a template
To import a template you'll need its HTML code. Consult your email provider's documentation if you're having trouble obtaining this.
Once you have this, head to the create a template screen and select the Classic editor.
Switch the editor to code view by clicking the </> button, and delete the existing HTML:
Then copy and paste your template HTML into this box:
Click Save in the top right. Your template will now be available when creating a campaign.