The direct addition of audio files as a standalone post format is not a native feature of Facebook. Unlike images or videos, Facebooks platform architecture does not allow for uploading audio files (such as .mp3, .wav, or .ogg) directly into a status update or as a separate post. Attempts to add audio directly will result in the file being unsupported.
The inability to upload raw audio stems from Facebook’s focus on visual and interactive content formats. Video content generally receives higher engagement rates. Historically, Facebook has prioritized features that support visual communication and real-time interaction to maintain user engagement and advertising revenue. The infrastructure is optimized for streaming videos and displaying images, not for hosting and delivering audio files independently.