python - Upload file to Flask API via Laravel HTTP Client

one text

I'm try to upload a file to my Flask API, via Laravel's HTTP Client But the flask is returning null.

This is the Flask endpoint

@app.route(f"{base_url}/submit-csv", methods=["POST"])
def process_file():
    return request.files["file"].filename

If eveything works fine, it should return the filename as response.

It works perfectly fine, If I try to upload the file via Postman.

But while using Laravel HTTP Client it doesn't work.

$file = fopen($input_file_full_path, 'r');

$response = Http::asForm()
        ->attach('file', $file, 'file.csv')
        ->post("$flask_host/api/scripts/FAO/submit-csv")
        ->json();

I don't know, what I'm doing wrong.