Error when sending a recorded audio

I am recording audio using ‘Audio Recorder and Visualizer’ plugin. Then I upload the recorded audio, and now want to send that File to an external self-hosted API where ‘sound’ is the parameter name. During API setup, the “initialize call” works fine, with response coming in ‘preview’ section. But when I trigger it while using my app, it gives me error.

It gives me this error: “API Connector error: the parameter sound is not a valid file

Following are the api setup, workflow, step-by-step and error images. Please help.


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