An audio card plays audio in either .mp3 or .wav format.
To create this card you need to create Send a Response action in the designer canvas and supply the relevant mark-up. It's important to note that this mark up must be added as an Attachment response and not a Text response.
The following mark-up is needed to create this card:
[AudioCard
title = Life Moves Pretty Fast
subtitle = Ferris Buellers Day Off
text = Ferris Buellers Day Off - Life Moves Fast
image = https://upload.wikimedia.org/wikipedia/en/9/9b/Ferris_Bueller%27s_Day_Off.jpg
media = https://wavlist.com/wav/fbdo-life.wav
buttons = Read More
]
An Example Audio Card