I have a friend who send me a pdf from windows si I can work on it , wich I was able to do . When I send the document back to her she was unable to open it ... Is there a way to send back the document so she can work on it at her turn ? is there a Mac/Windows way to make the pdf both side compatible ? thanks for your help .
PDF is a cross-platform standard. If your friend can't open the PDF's you're sending, they're damaged. You shouldn't really be editing PDF's at all, except to rearrange pages and add annotations. Edit the original document from which the PDF was produced.