Twilio is rejecting OGG audio attachments we are sending. Perhaps related to this:
https://support.twilio.com/hc/en-us/articles/360017961894-Sending-and-Receiving-Media-with-WhatsApp-Messaging-on-Twilio#h_01F63FCC54J22ZZFBERMF8058N
**WhatsApp outbound OGG is only supported when the ogg file uses the opus audio codec. These files may have the .ogg or the .opus extension.