iTunes on a Mac or PC makes this easier to see and do. You'll see both an option to play the movie you already own in SD/HD and then below that a purchase option for HD/4K.
Except if you own a movie in HD through a matched service (Movies Anywhere, Vudu, Amazon) iTunes on a Mac will only show the options to "Play" or "Download." There is no option to upgrade an HD version to 4K for any eligible title not purchased in iTunes.
I've submitted a feedback to apple stating that the version you own (HD for matched titles) need to show the HD badge in your library and there needs to be a link added to purchased the 4K version if you wish.
I hope this sorts out and they offer a solution to upgrade from HD to 4K for a nominal fee, not have to repurchase a movie in whole.
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Yep something is def going on. Power Rangers was a 4K title as well.
If you did any sort of library integration with Movies anywhere, you'll see a 4K badge on eligible movies in your library on the Apple TV. The key is to actually play that movie and swipe down. You'll see your only streaming in HD as your title is not eligible for a free upgrade to 4K as it wasn't purchased through Apple.
I hopped on the Apple TV 4K when Movies Anywhere came out and purchased a bunch of 4K eligible titles through Vudu and Amazon syncing them to my iTunes library as reports were coming out that people were getting those titles upgraded for free to 4K.
I'm not going to say I feel duped as Apple only ever said they'll upgrade to 4K your titles purchased through iTunes, but damn look at most all reports (The Verge, Engadget, etc) when Movies Anywhere came out and they showed screen shots of the TV app - Library on their phones and it showed the 4K badging. No one did enough digging to see that yes iTunes shows that badge, but you're library only has the HD version.
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Is there a workaround to rebuying a movie in 4K after you already own it in HD? I redeemed Spider-Man home coming in movies anywhere and got the HD version ported everywhere. I want to buy it in iTunes to get the bump to 4K.
According to a phone conversation I'm having right now with Apple. You can only delete the title from your library and repurchase it though iTunes at the 4K area.