DocumentOrganizer/Diligent.WebAPI.Host/Methods/Upload.cs

namespace Diligent.WebAPI.Host.Methods
{
    public class Upload
    {
        public static async Task<string> SaveFile(string root, IFormFile file, string path)
        {
            string fileName = new String(Path.GetFileNameWithoutExtension(file.Name).Take(10).ToArray()).Replace(' ', '-');

            fileName = fileName + DateTime.Now.ToString("yymmssfff") + Path.GetExtension(file.FileName);

            var filePath = Path.Combine(root, $"wwwroot/{path}", fileName);

            using (var fileStream = new FileStream(filePath, FileMode.Create))
            {
                await file.CopyToAsync(fileStream);
            }

            return fileName;
        }
    }
}