Multipage PDF turns into single page when editing in AI

Constantly.

When opening a multi-page pdf you will get a window that shows 2 sets of numbers.

1. the page you are on, and

2. the pages in the document

You have to open the first page by entering 1's in both fields - save as pg1

Then reopen original pdf and save the second page by entering 2 in both fields

etc...

You can report and vote here, and post the link back in this thread.

https://illustrator.uservoice.com

yes! and all you needed was update a single page. My previous macbook 2011 with CS5 gave me no issues. I had the luxury of updating PDF files quickly without having to go back and resave AI then export out. Now it is a nuisance having to deal with revisions for small changes.

Looks like this problem:

https://community.adobe.com/t5/illustrator/multiple-page-pdfs-edit-single-page-doesn-t-save-back-to-multiple-page-doc-any-more/m-p/10646136#M146626

And this one:

https://community.adobe.com/t5/illustrator/modify-pdf-in-illustrator/m-p/10795658#M158025

Hi there,

Sorry to hear about the trouble you are facing with Illustrator. If I get your query correctly, after you edit the single page from multipage PDF when you save it, it replaces the complete file with that single page instead of just updating that single page in the original file? If yes,  I would request if you can share a few more details like: 

1. Operating system and Illustrator version.
2. In which software the file was created?
3. Could you please share the step by step workflow, it would be great if you can share a small video of the issue.
4. Is the issue related to a specific document? 

Regards

Rishabh