Editing multipage pdf document in Photoshop

[python01]

I want to edit multipage document in Photosop. When I open the document I get to select which page I want to edit. When I save the document after editing it saves only that one page.
How can I replace the page in the original document with the edited page and keep it as one multipage pdf document?

 

[Alosolo]

Break down the pdf into single pages, edit each single that you need, and them merge them back together into one pdf

 

[python01]

What software do I use to merge it back?

 

[Alosolo]

Either pdf creator, you can google for it, or use a free online service like http://www.freepdfconvert.com/

 

[shepPettibone]

Photoshop is not the best place to work around with pdf files for sure. At least Adobe has Acrobat for such a purpose, but if it's too expensive for you, you might well try this tool to edit pdf which is slightly cheaper and has not the main features cut off