I do not understand why they have not fixed the sync issue after so long. Files go missing mysteriously on my iPad and the app messes up with files not within the Marginnote 3 folder. It is frustrating that you could lose important documents by using this software. Customer service is absolutely zero. They don’t even take the time to give you a short reply.
We do apologize to you sincerely for your issue. I am very concerned about the problems you encounter. So could you please give me more information about your device model (mac,iphone,ipad) , IOS version and please check if your Marginnote version is newest which could be seen in apple app store. Honestly, we rarely hear about files lost issue. Please help us locate the reason.
MN Support team