It's important to understand the distinction between protected and purchased music when downloading files to your H2O Audio device: Accepted File Formats: Your device supports MP3, M4A, WMA, and APE formats. Ensure your music files are in one of these formats and are DRM-free. Subscription-based Services: Music from platforms like Apple Music, Spotify, Amazon Music, iHeartRadio, and Pandora is typically protected with DRM and cannot be directly downloaded to your device, as these services offer access to music rather than ownership. Direct Downloads Only: Your device accepts files that are directly downloaded and unprotected. This ensures compatibility and uninterrupted playback.