Transfer audit data using SSIS
The Audit Transformation in SSIS Data Flow 'Other Transforms' section is really just for adding data about the environment in which the package is running to the data flow, things like the package name, package id, computer name etc.

If you want to work with SQL Server Audit data that has been output to a file, you probably want an OLE DB Source running SQL similar to this, and some kind of management around which audit files you've already imported:

SELECT *
FROM fn_get_audit_file ( 'S:\SQLAudit\auditTableAccess_*.sqlaudit', DEFAULT, DEFAULT );


This article covers that process quite well:
https://www.mssqltips.com/sqlservertip/3444/automate-the-import-of-sql-server-audit-files-into-sql-server-using-powershell/