I am having an error that I can’t solve when sending an image through postman to an api that I have created in AWS, I process the request in a lambda function and to read the content of the image I decode it in base64 to later save it in a bucket of s3 with the following code:

def lambda_handler(event, context):    
    
img_data = base64.b64decode(event['body'])
  
    # Guarda la imagen en un archivo temporal
    aux_path = '/tmp/{}.jpg'.format(generate_unique_id())
    with open(aux_path, 'wb') as f:
        f.write(event['body'])
        
    # Sube la imagen a S3
    bucket = 'mys3'
    s3_key = '{}.jpg'.format(generate_unique_id())
    s3.upload_file(aux_path, bucket, s3_key)
    
    return {
        'statusCode': 200, 
        'body': json.dumps({'message': 'file saved successfully'}), 
        'headers': {'Access-Control-Allow-Origin': '*'}
    }

The problem is that when decoding the image I get the following error:

raise ValueError(‘string argument should contain only ASCII characters’)

In the API configuration I have added as binary media type / so there should not be the problem.

Any suggestions ? Thank you very much

I am trying to save an image in s3 with a lambda function. I am sending the image through postaman to an api created in aws.