Not sure how you're not seeing Save as an option. Using the Document > Replace Pages command doesn't affect Save vs. Save As.Save As, however, is a better option for you to use when editing PDF files. You'll find the file sizes to be smaller after using Save As and overwriting the older document version.
ted
The author of numerous books on Acrobat, Photoshop, Illustrator and the Adobe Creative Suite, and an international speaker on Adobe Acrobat, Ted Padova is a well-known PDF guru.
ted
The author of numerous books on Acrobat, Photoshop, Illustrator and the Adobe Creative Suite, and an international speaker on Adobe Acrobat, Ted Padova is a well-known PDF guru.