Thank you for the response. I appreciate it. That is good news about the format not applying to the 6s, much better than being forced to use it.
Yes, the inability to see the files was a different issue. I solved it yesterday on my own. The solution apple is publishing is incorrect and I've left comments on those threads when I discovered that it was incorrect, however I did not go back and post the correct solution.
Oddly enough, the solution to my problem of Win7 explorer being unable to see any of the files on my iphone 6s was solved by going into my pc's control panel, autoplay, and turning on autoplay for the iphone.
I think it is odd to need to need to change a setting on the pc when it was the iphone that updated. I guess prior to ios 11.0.x autoplay wasn't required to see the files?
I can't of course guarantee it 100% anymore, but to the best of my knowledge, the only device that had an update was the iphone. If Win7 has a way of updating without permission like the newer MS OS, it only partly did it because it is continuing to nag me. Normally I would keep it up to date but the latest Win10 update on my laptop did not go well and I need to troubleshoot that before risking another.
I really don't care for these forced updates... I already have enough to do without unnecessary work being made for me.
fwiw, in case it helps anyone, ignore that quick-help box that google shows if you can't find autoplay, it's on the top level on the control panel, not grouped like they report (yes I've reported that as wrong also)