How to use Whisper API of OpenAI?

Hello, I was trying to use the data received from the microphone widget to call the audio endpoint of OpenAI,but the file only support uploadfile.
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And Also I try to use REST API, but the file format doesn't work by using base64 data.

Finally, I would like to try convert base64 to Blob but I found it seems like Retool doesn't support Blob object.
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And I also try to use Google Cloud Server but it seems even convert files into base64 in retool when get the response from GCS, So is there any solution to call the audio model of OpenAI from Retool?

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@Huayu_Qin I wonder if it's possible you're running into the same thing as @abusedmedia outlined in this forum thread?

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Thanks, that's very helpful!