***
Videos will play if connected to wifi or have a cell connection, though the tv app screen is blank for many seconds and looks like it has crashed. It's just taking forever. Things look fine once it loads, but attempting to watch anything will create the error "must connect to wifi/cellular to play"
*** I now think it IS a form of ill-conceived copyright check. But will soon be considered an issue if not a true technical bug. The app is incapable of making a distinction between copyrighted content (itunes downloads) and non copyrighted content.
The app is essentially saying "you have content on your phone (mostly from your computer), I can't connect to the internet so . . . PIRATE!"
If I'm allowed to download from itunes onto my computer, thats enough of a protection check for paid content, and the issue with self created content has to be a bug, or a major mistake.
A larger problem:
If you put the phone into airplane mode, videos will not be able to be played. I did this to simulate not having a viable connection. *** now anyone on a plane that wants to watch videos bought from itunes, ripped legally (remember the Rip. Mix. Burn campaign by Apple?) or home-created movies cannot watch them. ***
One very short-term partial solution I discovered is that if you start a movie in itunes, and then pause it. Then put it into airplane mode (or presumably lose internet/cell coverage) the video can be restarted and watched in it's entirety. I have successfully done this with a ripped (bought & paid for) movie (Ghostbusters), an itunes downloaded tv show (Stranger Things) and a video of my daughters softball game.
Another solution is to use a better player than than the TV app like VLC which is a free download. It has played just about everything. There are others, at varying cost.
Further: I found an older page focused on *** the issue of watching content on the buggy tv app.
https://appletoolbox.com/2016/12/cant-play-videos-after-ios-10-2-update-how-to/
It recommends relabeling everything in your library from Movie or TV Show to "Home Move". Unfortunately I tried that to no success.
They also recommend re-downloading the tv app , restarting, reloading the various content, etc.
I have tried some of those steps without success which was why I came here to this forum in the first place to try and determine if this was a technical bug or some new setting by Apple that could possibly be turned off.
***
<Edited by Host>