How do development .net core rest api take byte [] array

I developed an endpoint in .net core that takes parameters from FromBody as a byte array. This endpoint converts the incoming file into an image and saves it in the folder in the file directory.

I know that the byte array value is a file. But this byte array value comes from outside. I want to get this byte array with the endpoint I wrote. So while testing, I tried all kinds of methods from postman. I put debug but it doesn't go to the breakpoint section.

I want to test this endpoint How can I do?

Endpoint:

        [HttpPost("ConvertByteToImageFile")]        public async Task<IActionResult> ConvertByteTomageFile([FromBody] byte[] data)        {            //Resime çevirir.            var imageData = GetDataToImage(data);            try            {               //Convert Image.                SaveImageToFile(imageData);                return Ok($"Image saved successfully at");            }            catch (Exception ex)            {                return StatusCode(500, $"An error occurred: {ex.Message}");            }        }        [NonAction]        public Image GetDataToImage(byte[] byteData)        {            using (MemoryStream ms = new(byteData))            {                Image image = Image.FromStream(ms);                return image;            }        }        [NonAction]        public void SaveImageToFile(Image image)        {            try            {                var imageFolderPath = Path.Combine(Directory.GetCurrentDirectory(), "CameraFiles");                var imageName = Guid.NewGuid().ToString(); // Benzersiz bir isim oluştur                // Save image                var imagePath = Path.Combine(imageFolderPath, imageName);                image.Save(imagePath);            }            catch (Exception ex)            {                throw new Exception(ex.Message);            }        }