Sheet feeders can produce documents in reverse order. Reorder existing pages using their thumbnail controls rather than rescanning.
A scanner that pulls from the bottom of a stack gives you the document backwards. The fix takes seconds once the pages are in front of you, and it is a great deal faster than feeding the paper through again.
Reordering and rotating in the same pass saves you a second round trip. A stack fed in at ninety degrees usually needs both, and doing them together means you only verify the result once.
The thumbnails render on your own device, which is why a long document takes a moment to display. Nothing is being uploaded during that wait.
Each page has buttons to move it one place earlier or later, and the thumbnails update as you go. For a document that is only slightly out of order, a few presses is quick. Check the thumbnails against what you expect before you save.
For a large move, such as taking the last page to the front, it can be easier to use Split PDF to pull out the pages you need and Merge PDF to put the pieces back in the right order. The pages are copied rather than redrawn, so the text and quality are untouched.
Use its Move later arrow until it reaches the required position. There is no drag-and-drop control.
Barely. The same pages are written back in a different order.
No.
Yes, each press moves it by one place. For a big move, split out the pages and merge them again in the order you want.