Shared document should open in the app that owns the file type

Number:rdar://47406335 Date Originated:19 Jan 2019
Status:Open Resolved:
Product:iOS UIKit Product Version:
Classification:Bug Reproducible:Always
When a user is sharing an iCloud Drive document of a document-based app using `UIDocumentBrowserViewController`, `UIDocumentPickerViewController` or `UIActivityViewController`, the recipient will get a message and upon tapping that link, the document will show in the Files app. *It would be nice, if the file could open directly in the app, if it's already installed.*

Steps to reproduce:

- Present `UIActivityViewController` providing both the URL to a document that is stored in iCloud Drive as well as a string.
- Launch the app and tap the "Add People" activity.
- Select message or mail and share it with someone.
- On the device of that other person, open the message.
- Tap the link in the message and confirm with "Open".

Expected result:

- If the app is installed, the document should open right in the app.

Actual result:

- The document is displayed in the Files app.


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