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Take a screenshot, scroll down by about half to three quarters of a screen, take the next one, and so on. Each screenshot needs some content in common with the next (about a quarter of the screen) so Longsnap can line them up. Don't rotate the phone in between.

Longsnap couldn't find where the screenshots overlap. Usually you scrolled too far between them, or they are from different screens. Take them again with more overlap.

If one screenshot doesn't overlap the next, Longsnap stitches the longest run that does join up and tells you how many it used.

In the order you took them, whatever order you tap them in. Up to 20 at a time, all from the same screen size.

Yes: Settings › Keep status bar. The current image is stitched again with the new setting.

Very long results are split into several images so that every app can open them. Save or share them together.

Save adds it to your photo library. Share sends it to any app.

Nothing, unless you choose to delete them after saving. Then iOS asks you to confirm, and they move to Recently Deleted in Photos, where you can recover them for 30 days.

With Limited Access, Longsnap can only read the photos you allowed. Tap "Select more photos" in the app, or open Settings › Longsnap › Photos and choose Full Access.

If you use "Optimize iPhone Storage", screenshots you pick are downloaded from your iCloud by Photos first, which can take a moment.

Yes. Screenshots are stitched on your iPhone and never uploaded; the app only sends anonymous crash reports. See the Privacy Policy.