Happy to oblige.
Apostolic tradition, or succession by definition, is the faith handed down from the Apostles, who in turn, received it from Jesus himself. Ergo, any missionary activity undertaken by the Apostles, was as a result of the commission which they received from Jesus. That is the essence of Apostolic tradition. "Tradition" is not the preaching of a gospel which finds no basis in Scripture or which somehow, over the years, became an item of popular culture like the Macy's Thanksgiving Parade. It is the unbroken episcopal lineage which traces itself back to the Apostles and through them, to Jesus.
Philip, being one of the original 12 Apostles, stands at the very heart of that Apostolic tradition. His preaching to the eunuch stands as an excellent example of it.
At various points in history, that episcopal lineage has been ruptured due to disagreements over theology, pastoral practice, scandal and various other issues. As a result, new theologies have been proposed and preached, often using Scripture as their basis but proposed in a manner divorced from the successors of the Apostles.
In summary, the tradition used by Philip, was the tradition of Jesus Himself and imparted to the Apostles at Pentecost through the Holy Spirit.
Continue to be happy; please.