mdmcc77 Said:
"How do I access content in an app that’s no longer available in the App Store?"
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Apps being Removed from the App Store:
Loss of data is something you would have agreed to upon opening an Apple Account. So, if you never backed this up, then it may be gone. Sometimes, apps are removed from the App Store and never become accessible again. It all has to do with licensing between Apple and then Developer. So, if an option of the app, learn to export it. Also, take a screenshot of its contents, every-so-often: Take a Screenshot on your iPhone - Apple Support