Hi Mike,
thank for answer.
With the import button you can import one bundle one by one, but we needed to import the entire .gz file.
We received an answer for Petr Myska, via Yammer:
-------
Place both tar.gz files into import directory in ACC installation. Bundles will be imported into internal repository (ACC restart is not needed).
Then when creating new package in UI these new bundles will be used. You can also replace bundles in existing package to create new version of package with updated bundles.
-------
Regards,
Marco