In order to send an voice message to specific contact, navigate to Contacts and click on the contact you would like to send the voice message to.
In their profile card, you will see the Message button.
Click on it and select Send Voice
Now, you have 2 options :
Send a voice message using AI text to speech
Upload your own pre-recorded voice message
Send a voice message using text to speech
In order to generate a voice message for free, you need to write your text, choose a language and a voice from the free available voices :
Man - Male
Woman - Female
Other more advanced voices are available but Twilio will charge an extra fee for them
Send a voice message using your own pre-recorded voice message
In order to send your own pre-recorded message, just click on Attach - Attach Audio and upload your MP3 file.