Hi,
Open-in/Share Filtering you can read about here:
https://learn.microsoft.com/en-us/mem/intune/apps/app-protection-policies-exception#ios-data-transfe..."Policy managed apps with Open-In/Share filtering: Allow transfer only to other policy managed apps, and filter OS Open-in/Share dialogs to only display policy managed apps. To configure the filtering of the Open-In/Share dialog, it requires both the app(s) acting as the file/document source and the app(s) that can open this file/document to have the Intune SDK for iOS version 8.1.1 or above."
This option is really meant for apps that are part of the same APP policy and are built with the Intune SDK, thats the reason you only see those apps in the share box, they fulfil these two conditions.
One Drive should be a easy fix, you can just add the app to the current APP. But the two other system apps are more difficult. You need to exempt those apps from the APP policy, you can use 'Select app to exempt' in you screenshot to accomplish this. Here is some info:
https://learn.microsoft.com/en-us/mem/intune/apps/app-protection-policies-exception#ios-data-transfe...https://learn.microsoft.com/en-us/mem/intune/apps/app-protection-policies-exceptionAs you can read there you need the iOS URL protocol scheme, this is really opaque and I do not know the schemes of Pages and Numbers on iOS, you can read little about it here:
https://www.amobileattempt.com/2019/04/intune-app-protection-policies-and-ios.htmlYou could try to ask Apple if you have connections with them but I doubt they will deliver the answers.
Maybe it would be better to start looking for alternatives like Work and Excel..