[Zubersoft]

It sounds like what you want is for the CSV import to update the source PDF with bookmarks corresponding with what is in the CSV. MobileSheetsPro will certainly not do that, and I think most users wouldn't expect that to happen. That's really outside the scope of what that feature is intended for. The CSV import won't create bookmarks of any kind - only importing a PDF normally (with the setting I mentioned enabled) would. If you imported a single PDF, added MobileSheets bookmarks, then exported that song, the PDF that was generated would contain those bookmarks. 

Mike