invalid media hmac for audio messages, sended with drag-n-drop

[Nikitian]

Problem: can not download sended audio message
Steps for reproduce:

1. Send audio file (mp3) throught drag-n-drop with whatsapp web application
2. Fires HandleAudioMessage()
3. Try to execute Download() method
4. Seen invalid media hmac error

If file sends through "Send document" drop-down menu, file successfully downloads (web version hasn`t "send audio" option).
If audio message records into whatsapp web-app, file successfully downloads.
Problem only for drag-n-drop sended mp3 files.

[DonovanDiamond]

Unfortunately, this package is not being actively maintained currently and will soon be unusuable as WhatsApp updates to multi-device. Please look at tulir/whatsmeow for a Go WhatsApp Web API that is actively maintained and supports WhatsApp multi-device.