Problem uploading files via asp.net core api

Question

Why can I upload files via the Postman application, but when I use Microsot, I cannot upload where is the problem with the following code?

Model is:

public class Book
{
        [Key]
        public int BookId { get; set; }
        [Display(Name = "Book name")]
        [Required(ErrorMessage = "Data feild is required")]
        public string BookName { get; set; }
        [Display(Name ="Book details")]
        [Required(ErrorMessage = "Data feild is required")]
        public string BookDetails { get; set; }
        [Display(Name = "Publish date")]
        [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
        [Required(ErrorMessage = "Data feild is required")]
        public DateTime BookPdate { get; set; }
        [Display(Name = "Book name")]
        [Required(ErrorMessage = "Data feild is required")]
        [ForeignKey("Author")]
        public int AuthortId { get; set; }
        public virtual Author Author { get; set; }
        public string ImagePath { get; set; }
        [NotMapped]
        public IFormFile ImageFile { get; set; }
}

Client controller method:

[HttpPost]
public IActionResult AddOrEdit(Book book)
{
    if (book.BookId == 0)
    {
        HttpResponseMessage resp = GlobalApiClient.webApiClient.PostAsJsonAsync("Books", book).Result;
        TempData["SuccessMsg"] = "Saved Successfully ... ";
        return RedirectToAction("Index");
    }
    else
    {
        HttpResponseMessage resp = GlobalApiClient.webApiClient.PutAsJsonAsync("Books/" + book.BookId , book).Result;
        if (resp.IsSuccessStatusCode)
        {
            TempData["SuccessMsg"] = "Updated Successfully ... ";
        }
        else
        {
            TempData["SuccessMsg"] = "Updated not complete ... ";
        }
        return RedirectToAction("Index");
    }
}

Api controller method:

//// PUT api/<controller>/5
[HttpPut("{id}")]
public async Task<IActionResult> Put(int id,[FromBody] Book book)
{
    if (ModelState.IsValid)
    {
        try
        {
            if (id == book.BookId)
            {
                string fileName = book.ImagePath;
                if (book.ImageFile.Length > 0)
                {
                    string path = hosting.WebRootPath + "\\Uploads\\";
                    if (!Directory.Exists(path))
                   {
                        Directory.CreateDirectory(path);
                    }
                    using (FileStream fileStream = System.IO.File.Create(path + book.ImageFile.FileName))
                    {
                       book.ImageFile.CopyTo(fileStream);
                       fileStream.Flush();
                   }
                }
                book.ImagePath = fileName;
                await bookRepo.Update(book);
                return Ok();
            }
            return NotFound();
        }
        catch (Exception)
        {
            return BadRequest();
        }
    }
    return BadRequest();
}