Q: Hello Apple community... I am trying to combine multiple pdf's into one, using preview, but when I drag the additional pages they show up as separate documents.

According to an Apple Support article, unless there are unforeseen issues

in file ownership or permissions, the combining of .PDFs should be simple.

•OS X: Combining PDF documents using Preview - Apple Support

There are a few variable and similar methods, some change with version

of OS X in use; some vintage OS X may vary a little in the process...

A variety of similar topics appear in search results, with terms:

" mac os x combine pdf into one " such as this page shows...

https://www.google.com/?gws_rd=ssl#q=mac%20os%20x%20combine%20pdf%20into%20one

If the system is older than Mavericks there may be other methods to try.

Suggestions are among linked results in the search. I see a few fair ones.

•Here's another that offers generally similar suggestions...*  this info looks OK, extra links, do not:

http://osxdaily.com/2014/06/27/how-to-join-multiple-pdf-files-into-a-single-pdf- document-in-mac-os-x/

{ note: avoid clicking on links to products in * this ^ page, since they likely will not help & may be adware prone }

If you have a problem after trying other methods, based on an OS X

your computer is running, post back with more exact information...

Good luck & happy computing!

edited