If you've opted for quarterly GSTR-1 filing, you can only file your return for the entire quarter in March. While GSTR-3B payments are monthly, the GSTR-1 and GSTR-3B returns themselves are filed quarterly. You'll be able to upload and submit your January return along with February and March data in March.
16 February 2021
Sir while preparing GSTR-1 for the month Jan 20 ,we are come under quarterly. we unable to record B2C transaction ,only B2B Can uploaded . One more thing we are unable to submit and file the return . That option is not available for us. Please advise in this case.