A long PDF can contain a very small thing you need: a few pages from a report, an application, or a set of meeting notes. I let you pick those pages and save them together as one new PDF. Tap the thumbnails, or enter something like 3, 18, 42-46. That selects seven pages. They keep their order in the original document, whichever one you picked first. The distinction matters when the pages are scattered. You can collect them into one file without dividing the whole document into separate downloads. Before saving, open a larger preview to check what you have selected. Your PDF stays on your device, and the original file is left unchanged. The new copy has some limits: form fields become fixed page content, bookmarks are not carried over, and links to pages inside the original are removed. The guides explain these limits before you need to rely on the result.