Custom message for "Add People" activity ignored

Number:rdar://47406314 Date Originated:19 Jan 2019
Status:Open Resolved:
Product:iOS UIKit Product Version:
Classification:Bug Reproducible:Always
When a document-based app used `UIActivityViewController` and provides the URL to a document that is stored in iCloud Drive (e.g., use `UIDocument.fileURL`), the "Add People"/"Show People" activity will be available. This let's users share the iCloud Drive document with other users.

*It would be useful if this activity would pick up other activity items, in particular strings, so that a custom message can be passed on.*

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 the message or mail option.

Expected result:

- The string is part of the message or mail, along with the default link to the shared document.

Actual result:

- The message or mail only consists of the default link to the shared document, the string is ignored.


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