1) Open the corrupted file
2) Click File
3) Click Properties. If the path shows \\abdo-sqlxx\workpapers\xxxxxx then the pdf is in engagement and may require input from I. T. to correct. If you have the file in your U: then the steps are as follows.
4) Right-click the PDF in File Explorer
5) Select Combine files in Acrobat
6) Select Multiple if applicable and verify that all items from the file are selected
7) Then select Combine Files
8) Follow any prompts and save the new file.
9)The file should now be repaired and allow you to replace pages etc.
10) Open the new file and adjust the pages and bookmarks as needed.
11) Remove the old copy of the PDF from the binder and add the new one if applicable.