Question: how to upload fvu file?
Answer: Go to https://onlineservices.tin.egov-nsdl.com/TIN/JSP/security/Login.jsp. Enter your User ID and insert the DSC token. Login using eToken Name and Password and system launches upload screen. Go to Upload > TDS/TCS. Enter TAN/TFC ID, File Reference Number, Date and click on Submit button. System shows the status.