If you wish to create a QR Code which on being scanned will redirect users to an audio file, you can do so by creating an Audio QR Code.
Here's how you can create one:
Choose the Audio QR Code from the All category. You can also search for it using the search bar
Click on the Upload button and choose an audio file of format .mp3 that you wish to save in your QR Code
Once the file is uploaded, click on Create QR Code
A Save QR Code window will open. Enter the name of the QR Code and click on Save
You can then proceed to Design and Download your QR Code
Note: You should always scan & test your QR Code before downloading the final image