Uploading image via ASP.NET Core Web API gets corrupted

Question

I'm developing an ASP.NET Core Web API that posts an image and saves it to the server.

When I using Visual Studio, it works fine and saves the image in the Pics directory.

But when uploading it to Windows VPS, it saves the file, but there is no size - it means it's corrupted.

[HttpPost]
public async Task<ActionResult<ImageFile>> PostImage([FromForm] ImageFile image)
{
    try
    {
        // string Pic = Path.GetFileNameWithoutExtension(image.AttImage.FileName);
        string path = Path.Combine(wwrootPath + "/Pics/" + RandomString(32) + ".jpg");

        // Logger.LogError("Omar1 : " + path);
        if (image.AttImage == null)
            return null;

        using (var filestream = new FileStream(path, FileMode.Create))
        {
            _= image.AttImage.CopyToAsync(filestream);
        }
                
        image.ImagePath = path;
        image.CreatedDate = DateTime.UtcNow;

        // Logger.LogError("Omar2 : "+path);

        _context.Images.Add(image);
        await _context.SaveChangesAsync();

        return image;
    }
    catch (Exception ex) 
    {
        Logger.LogError(ex.Message+" : "+ex.InnerException);
        return null; 
    }
}

I searched for many solutions and give the Pics directory full control permission but the problem persists.

Does anyone have any idea?