We traveled with extended family last month at Movies. I requested connecting or adjoining rooms on the reservation, put their reservation number in, as well as their last name. I called to extend my stay a few weeks before our trip. I also wanted to double check that my request was noted. NOTHING was on there. So if you requested online, I would call also.
In the end, we were granted the request and had connecting rooms. We were also upgraded from Standard to Preferred. I guess because there were no connecting rooms available in Standard, so that was nice of them.
I should also add, that neither of us did online check in.