You can modify selected pages in an external application. When you close the external application, you import the updated pages into your document.
The administrator defines which external applications are available in the 'Tools' menu.
Select the pages that you want to use in the external application.
An external application can be configured to accept only 1 PDF page. When you select multiple pages, the concerning external application is not available to you.
Click [Tools] - [External applications].
Select the required external application.
The selected pages will be exported to the external application.
Use the external application to modify the selected pages.
Save your changes and close the external application.
Click [Import] to import the selected pages into the application.
Click [Cancel] to discard the changes that you made in the external application.