I am supposing some situation.
I lose my iPad and someone get my iPad and delete ‘Margin Note 3’.
Then, can I restore all data including Doc, MindMap, Deck?
I tested this situation.
I just deleted and reinstalled ‘Margin Note 3’.
As a result, all the original PDF files were restored from iCloud.
The files were very clean.
Note(Doc, Mindmap), Deck were not restored.
Is this normal? or is there something wrong?
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@Sushi_Support-Team Have a look
Hello, Boonga,
I’m really really really sorry that I ignore your post. 
If you have selected MarginNote 3 in your iCloud Drive. You can find your synced Notebook(Doc, Mindmap) and Card Deck in “Cloud Sync”. In normal cases, MarginNote 3 will sync your files automatically. But if you find these files aren’t restored from iCloud, please download them manually. And here are some screenshots for better understanding.
Sincerely,
Bryan
MN Support Team