Deep link expressions entered into Broadcast Notification tab in Users do not save.
My process to send push notifications with a deep link:
Enter in a title and body in the fields under Broadcast Notifications
Enter the deep link expression (the expression shown was one I used recently that didn’t go to the view specified or force a sync when clicked) and click save
Click send notification (the deep link expression didn’t show up after pressing save on the deep link pop up in step 2)
Further context: My app is one that is available in the app stores and is under a Publisher Pro license.