Can I sync the Goodnotes documents from my iPad to the Android app?
Not yet, but it’s coming soon!
In the mean time, here’s a way to share notebooks from GoodNotes 5 to Windows Android, or Web:
Make sure “Use iCloud" is enabled in in GoodNotes 5 on iOS/iPadOS/macOS.
Open a document that you want to share in GoodNotes 5 on iOS/iPadOS/macOS.
Tap the Share icon in the navigation bar > Enable Share Link to Collaborate.
Tap on Sharing Settings and make sure "Open Document on Web" is enabled (available in the full version only).
Tap Send Link to share it.
See this help article for more information.