Confirmation fields not working from slack app

[ambreensh]

https://api.slack.com/docs/interactive-message-field-guide#confirmation_fields

Based on the documentation above, I implemented a confirmation dialog for the message, it works fine on the macOS desktop app and when I click on the button the confirmation dialog appears as expected, but the confirmation dialog is not appearing in the slack iPhone app.

is it expected behavior or a potential bug in the app ?