Answer 1

If the audio is already uploaded on the internet , just copy paste the link .
if the audio is only in your mobile , you need to uploaded to Dropbox or Google drive so you can use the link.
check these :

https://code.sololearn.com/Wa25A17a19a1/?ref=app
https://code.sololearn.com/WW6t4B73kJVz/?ref=app