Missing Document Configuration warning when publishing to Apple appstore

When I publish my ionic 3 app to the apple appstore, I always get the warning below:

Missing Document Configuration - By declaring the CFBundleDocumentTypes key in your app, you’ve indicated that your app is able to open documents. Please set the UISupportsDocumentBrowser key to “YES” if your app uses a UIDocumentBrowserViewController. Otherwise, set the LSSupportsOpeningDocumentsInPlace key in the Info.plist to “YES” (recommended) or “NO” to specify whether the app can open files in place. All document-based apps must include one of these configurations. For more information, visit https://developer.apple.com/document-based-apps/.

Any idea how to fix this and stop the warning from happening every time I publish to the app store?

Seriously, nobody has seen this before or can help in any way?

Never had this warning but you can set in your info.plist as the warning said.
Set UISupportsDocumentBrowser or LSSupportsOpeningDocumentsInPlace (don’t know which one you are using) to YES.
With Xcode you can change your info.plist file.
Something like this - https://docs.microsoft.com/en-us/xamarin/ios/app-fundamentals/file-system-images/51-supports-opening.png

Thanks for the reply. The strange thing is, I wasn’t aware that I was using either UISupportsDocumentBrowser or LSSupportsOpeningDocumentsInPlace.

How do I find that out?

Maybe you can find something in the plugin that you are using.
Github’s plugin page may have some info about it.