No — Podpage is a website builder, not a podcast host, so you can't upload audio files directly to Podpage.
To get episodes on your Podpage website, host your audio with a podcast hosting service like Buzzsprout, Transistor, or Libsyn. Those platforms store your audio files and generate the RSS feed that Apple Podcasts, Spotify, and Podpage all use to display your episodes. Podpage works with any podcast host with a valid RSS feed.
Once your feed is connected, Podpage automatically imports every new episode and builds an episode page for it — no uploads needed.