Concatenating .pdf files

The following is a shortcut I stumbled upon recently.
I strive to run a paperless office, as much as possible.
I scan, (to .pdf), Bank and other statements that I receive on a regular basis.
Rather than have a mass of individual statements, I concatenate them into one link or chain, the latest being the first link.

The steps I take are:

  1. Open the scanned Statement with Preview.
  2. Select the Statement in EagleFiler and open in Preview (Command>Shift>O)
  3. Ensure Sidebar in Preview is open.
  4. Drag Preview Thumbnails of 1. to first position in 2.
  5. Save & Quit Preview.
  6. EagleFiler automatically updates.