It is a limitation of the current DOC/PPT to PDF conversion function, which cannot be fixed easily. Please convert the file to PDF first, then import that PDF into GoodNotes:
- Open that file on your iPad. For example, if the file's in iCloud Drive, you can open it there.
- Tap the Export button > Print.
- Spread with 2 fingers over the Print Preview panel.
- Tap the Export button > Open in GoodNotes or Copy to GoodNotes.