Yes, you can file eTDS online via NSDL without the help of a TIN Facilitation Center.
It is pretty simple to upload a validated FVU to TIN central system
The prerequisites are i. DSC for the authorized signatory ii. Registered and activated user in TIN Services Portal iii. A validated FVU from greytHR 3. We recommend referring the step by step procedure to upload validated FVU to NSDL