Can't access clipboard

I cannot access my onscreen keyboard's clipboard when I'm in Zoho's Notebook app but can access it in all my other apps except my Opera mobile browser. "Text copy" is enabled within the Notebook app's privacy and security settings so that can't be the reason. Is this a bug or a security feature?

My Opera mobile browser also does the same thing in not allowing users to access the clipboard within the browser, but that is to prevent websites accessing sensitive info that might be in the clipboard such as copied passwords. However, I don't get why Zoho would implement such a security feature without the option to turn it off, as the Notebook app isn't a browser. Not being able to access the clipboard is a dealbreaker for me in a notes app.

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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