Try these in order:
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Storage Ensure you have free space. Delete a large file or two and retry.
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Network Switch to Wi‑Fi; some cellular plans or captive portals block podcast media.
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Retry Cancel the download, then start it again from the episode menu.
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Restart device Clears OS‑level download glitches.
If downloads keep failing, email support@polypod.app with the podcast + episode.