Onebox play button greyed out on attachment

Greetings friendly friends

I’m working with a voicemail forwarder that emails the .wav file to our community. I’m having some problems with the onebox: The file gets attached as .wav, so it is embedded in the post, and clicking allows download.
Copying the link into a new post creates a onebox as expected, but the play button immediately greys out. I presume this is a forwarder problem.
Is there any way to automatically display a player/onebox for certain file extensions attached to a post? Much simpler to display a play button than expect users to all download the file, play it, then come back to the browser.

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New update seems to remove the download link for the .wav file and now we only see the non-working onebox player.

included markdown from the automatic attachment from the email post:

![msg0000.WAV|audio](upload://62VzeP3WyOFBa9reBmyAetnZpRs.WAV)