SMB protocols supported
You will need to enable NTLMSSP on your NAS/Files storage.
7er Software = SMB 3.1.1 - NTLMSSP is required for SMB2 or higher
6er Software = SMB 2.1 - NTLMSSP is required for SMB2 or higher
5er Software = SMB 1.0 only NTLMv1 supported
4er Software = SMB 1.0 only NTLMv1 supported
3er Software = SMB 1.0
2er Software = SMB 1.0
Below is an Image on where you will find the SMB protocols on a QNAP NAS.