File got corrupted and size is increased when uploading after publishing code on AWS Lambda function with .NET Core 3.1

I'm Uploading mp3 file in aws s3 bucket, when i upload from my local system its working fine and uploading file with same size. but after publishing on AWS, when i try to upload file, file getting corrupted and also file size is increased. Here is my API : I'm just returning file from here.

[HttpPost, DisableRequestSizeLimit]
    [Route("SaveSoundRecordingDataFile")]
    public async Task<IActionResult> SaveSoundRecordingDataFile()
    {
        try
        {
            var file = Request.Form.Files[0];
            return Ok(file);
        }
        catch (Exception ex)
        {
            return StatusCode(500, $"Internal server error: {ex}");
        }
    }

Check below responses I'm uploading 1MB size file you will find how file size are getting increased after publish code on aws lambda.

Response from Local System :

Response from local system

Response after publish on aws lambda :

Response from aws

I have tried many ways and go through many articles and forms but didn't find any solution why is this happening. Thank you in advance.