When you set up your scheduled imports there is a functionality that makes Symplify automatically generate new attributes from your file headers in case they do not exist in Symplify already or have not been mapped to any existing attribute.
So, if you add a couple of brand new column headers and the scheduled import runs after you have finished the set up, the file column headers will be auto created as new attributes by Symplify.
In this example our file has two new attributes, Discount_code and Discount_end_date, not existing in Symplify before the import.
When the import runs and Symplify detects the new file headers, the corresponding recipient attributes will be created.
The result in Symplify in Recipients attribute after the import:
Column headers in your file and the Attribute names may differ between your file and Symplify. If so, you need to add the file header name to the corresponding Symplify attribute before an import is made otherwise a new attribute will be created. See i.e. email address above.