@Farah Diana Masri Welcome to Microsoft Q&A Forum, Thank you for posting your query here!
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Please note that, the Azure AI Foundry’s Prompt Flow doesn’t currently offer native speech input options directly within the prompt flow interface. Considering some of the features within the prompt flow are still under preview, there could be more functionalities added in the future roadmap.
So for up-to-date information and any future updates, you can refer: https://learn.microsoft.com/en-us/azure/ai-studio/how-to/flow-develop
This documentation doesn't talk about anything speech input support as of today.
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As a workaround, you'll need to handle this part separately using other Azure services like Azure Speech Services (for speech-to-text). You can have a custom solution using ReactJS application to perform the Speech to Text:
https://github.com/Azure-Samples/AzureSpeechReactSample
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Then you can use that text as input to your promptflow.
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Hope this helps.