Thanks (as always). The problem is that when I attached those documents on the online reporting site, despite being accepted, my subsequent attempt to file a 90-Day Report online was rejected for the reason of no TM30.
That's why I'm trying to register the TM30 with the Section38 app, but have (so far) found it impossible to attach the necessary documents as Mutt Daeng was able to do in the reply above.
A trip to CW is extremely inconvenient, so the app is seemingly the way to go. Perhaps submitting it by registered mail is a viable option, but I'm afraid of being left in limbo not knowing whether or not it was accepted till the next online 90-Day Report was rejected, thus necessitating at trip to CW.