Hi @Devendra S,
Thank you for reaching out to Microsoft Q&A forum!
The voice gallery is a collection of voice styles and samples that can be used to preview the voices available in the Azure Text to Speech service. It is not recommended to use the sample URLs and styles from the voice gallery for production use as they are intended for testing and evaluation purposes only. Instead, you should use the Azure Text to Speech API to generate the audio files for your app.
To use the Azure Text to Speech API, you can send a request to the API with the text, language, and voice parameters, and the API will return an audio file in the specified format. You can then play the audio file in your app.
For more info: How to use the Azure Text to Speech API?
I hope you understand! Thank you.