how can i insert an audio file to my html page?

Answer 1

drop that audio in Dropbox first, then copy it's link and paste in audio URL

https://code.sololearn.com/W0lz7wOrE1SX/?ref=app

Answer 2

you can do that using audio and sources tags
Check this code

https://code.sololearn.com/W2XE5FI8jXL0/?ref=app
https://code.sololearn.com/WV796n6dPtJe/?ref=app
https://code.sololearn.com/WZCeH6d3bQvR/?ref=app
https://code.sololearn.com/WdXdhf3LD6l3/?ref=app
https://code.sololearn.com/W7ZfqC33LSn4/?ref=app