Started this as a coverall for any iOS 13 topics of interest to us, as there could be a few.
Just discovered that you can now read files via SD card, USB, or whatever. Tried the micro SD card from my newly installed Nextbase 522 dash cam, via a lightning SD adaptor, that I normally use for photos from cameras, and it works! So now you can access video directly onto an iPad without using the flaky app and wifi connection. Well pleased!
Not tried Carplay yet, but I know there are some improvements to that.