preserving bookmark using Aspose for java

Hi,

I am trying to merge two pdf files and I want to preserve the bookmarks for them. I tried the following code but it does not display the level 2(child) bookmarks and when I click on the bookmark it does not navigate me to the original page. I also wanted to know will the aspose preserve any bookmarks for pdf attachments.

OutlineCollection bms = pdfDocument.getOutlines();
        for (Iterator<OutlineItemCollection> it = bms.iterator(); it.hasNext();) {
           
            OutlineItemCollection outlineItem = it.next() ;
            OutlineItemCollection pdfOutline = new OutlineItemCollection(pdfDocument.getOutlines());
           
            pdfOutline.setTitle(outlineItem.getTitle());
            pdfOutline.setItalic(false);
            pdfOutline.setBold(false);

            GoToAction goToAction = (GoToAction) outlineItem.getAction();
            // Set the destination page number I have also used passing the goToAction in the below //line but it does not create the bookmark links.
            pdfOutline.setAction((GoToAction) outlineItem.getDestination());
           
            pdfDocument.getOutlines().add(pdfOutline);
           
        }

Any help will be appreciated.

Thanks