Need help with AI agent transcription issue

Hi All ,

This is my first post . Recently I start to play with AI Agent . I encounter issue unable to transcribe audio file to text

My error msg is cannot detect the Binary file. . This error happen when I add OpenAI Transcript file . Before this stage when I add Telegram “Get File” , I don’t get any error , I am able to get the file and also I can download the file and I can hear the voice with out any issue.

Below screenshot from OpenAI Transcript to text , the script it is correct ? ( I drag from file_ID )

I am able to download the audio file and I can hear the voice , the file extension is OGA it is correct ? ( I google it say that the file should by MP3 ))

I am using latest n8n version.i

My OpenAI I have add enough more money , ( I think OpenAI Transcripts to text don’t need subscription , only LLM need )

Hope some one can help me pls.

Paul Yeo