MVC Form POST handler (+file)

private static byte[] GetFileByteAray(IFormFile formFile)
{
    if (formFile != null)
    {
        if (formFile.Length > 0)
        {
            using (var memoryStream = new MemoryStream())
            {
                formFile.CopyTo(memoryStream);

                if (memoryStream.Length < 50 * 1024 * 1024)
                {
                    return memoryStream.ToArray();
                }
            }

        }
    }

    return null;
}

[HttpPost]
public IActionResult Edit(VMFormData vmFormData)
{
    var dbFormData = _dbContext.FormData.FirstOrDefault(x => x.Id == vmFormData.Id);
    dbFormData.TestText = vmFormData.TestText;
    dbFormData.TestTel = vmFormData.TestTel;
    dbFormData.TestUrl = vmFormData.TestUrl;
    dbFormData.TestEmail = vmFormData.TestEmail;
    dbFormData.TestNumber = vmFormData.TestNumber;
    dbFormData.TestPassword = vmFormData.TestPassword ?? dbFormData.TestPassword;
    dbFormData.TestCheckbox1 = vmFormData.TestCheckbox1;
    dbFormData.TestCheckbox2 = vmFormData.TestCheckbox2;
    dbFormData.TestRadio = vmFormData.TestRadio;
    dbFormData.TestColor = vmFormData.TestColor;
    dbFormData.TestRange = vmFormData.TestRange;
    dbFormData.TestDate1 = vmFormData.TestDate1;
    dbFormData.TestDate2 = vmFormData.TestDate2;
    dbFormData.TestDateTime = vmFormData.TestDateTime;
    dbFormData.TestMonth = vmFormData.TestMonth;
    dbFormData.TestTime = vmFormData.TestTime;
    dbFormData.TestWeek = vmFormData.TestWeek;
    dbFormData.TestHidden = vmFormData.TestHidden;

    // BEGIN: Handle file in database
    var fileArray = GetFileByteAray(vmFormData.TestFile);
    if (fileArray != null)
    {
        var dbFormDataFile = _dbContext.FormDataFiles.FirstOrDefault(x => x.Id == vmFormData.Id);
        if (dbFormDataFile == null)
        {
            _dbContext.FormDataFiles.Add(new FormDataFile()
            {
                IdNavigation = dbFormData,
                FileContent = Convert.ToBase64String(fileArray),
                Name = vmFormData.TestFile.FileName
            });
        }
        else
        {
            dbFormDataFile.FileContent = Convert.ToBase64String(fileArray);
            dbFormDataFile.Name = vmFormData.TestFile.FileName;
        }
    }
    // END: Handle file in database

    _dbContext.SaveChanges();

    return RedirectToAction(nameof(Index));
}