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I guess I know the answer but not fully sure; do we need to bring any hard copies of the submitted documents to the TLS center (except for passport, ILR BRP and appointment letter)?

My appointment is on 19th November 17:15. When is the latest I should press the submit documents? I remember there was a 48 hour before clause during my ILR application but for naturalisation, I did not see any rule on the website.

According to other members' experience, it seems TLS keeps the same timeframe for documents upload, so it's reasonable to think one can upload documents up to 48 h before the appointment.

The documents (originals) you mentioned are the only required during the appointment, no need to take hard copies of anything else - provided everything was uploaded on time.