Notebook Files Appear In The Old Zoho Docs, Why?

Hi, I have a paid subscription for Notebook. When I add an attachment to it, the file ends up appearing in my old Zoho Docs which will be discontinued next month. Please see these pics.

Why does this happen?

And should I be concerned about my data when Zoho Docs closes?

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Migrate your Notebook data to the new, mobile Notebook.
Zoho Notebook is transforming. The new version will include exciting new features and a completely new user experience. The initial version will be mobile based, available for Android and iOS. A new web version will be available after the initial mobile release. With the release of the new Notebook approaching, we're migrating most of your current data to the new version. Once the new version is released, there will be an additional window to migrate your data. We will not provide access to the