Make.com - Concatenate Audio Files

Transloadit
1

Hi,

I am trying to create a make.com automation flow where I concatenate 3 audio files in order. I am facing issues when parsing the following data. I am using Transloadit native integration module > “Create an assembly”. As for The method of presenting the instructions of the assembly *I have chosen a “Step” and have pasted the following in the Steps body:

{
  "steps": {
    "first": {
      "robot": "/http/import",
      "result": true,
      "url": "https://demos.transloadit.com/inputs/powered-by.mp3"
    },
    "second": {
      "robot": "/http/import",
      "result": true,
      "url": "https://demos.transloadit.com/inputs/powered-by.mp3"
    },
    "merged": {
      "robot": "/audio/concat",
      "preset": "mp3",
      "result": true,
      "ffmpeg_stack": "v6.0.0",
      "use": {
        "steps": [
          {
            "name": "first",
            "as": "audio_1"
          },
          {
            "name": "second",
            "as": "audio_2"
          }
        ]
      }
    },
    "export": {
      "robot": "/export/url",
      "use": "merged"
    }
  }
}

I am not sure what the issue is but it keeps giving me a 400 error.