Having a trouble with connecting an API that response with wav file

I’m trying to connect an TTS(Text to Speech) API that returns an .wav file. And the command below is the curl of the API.

curl -o result.wav -X POST "https://server-tensor-flow-tts-psi1104.endpoint.ainize.ai/predict" -H "accept: application/json" -H "Content-Type: multipart/form-data" -F "language=english" -F "feature_generator=TACOTRON" -F "vocoder=MB-MELGAN" -F "input_text=This is test sentence."

I tried to import from cURL with API connector plugin, and initialized it. But it keeps return an 500 error, although the curl command works as expected on my local machine.

Can anybody know how to connect this API?
FYI, the API doesn’t require any authenticaion.

Thanks in advance!