To load an audio file, follow the steps from your main dashboard:
Go to Telephony
Audio Files
Create
Choose File
Upload File
You may upload files with a total size of no more than 8 MB per single upload. Only the following audio formats are supported: wav, mp3, wma, ogg, oga, gsm.
To convert an audio file into mp3, foloow the link: https://audio.online-convert.com/convert-to-mp3