Got my extension a couple days ago.

Ubon Imm insisted that next 90-day report be done online.

How can I show my updated bank book online?

 

 

That's easy, just go to the office, present your bankbook. And, while you're at it, give them your passport and ask for the 90 day address check. I doubt they'll refuse, and if they do, then go home.  However, I'm guessing you already know that doing a 90 day check online means doing it 15 - 7 days prior to the actual date...