The Users and Groups assigned to applications should dynamically be used for Collections
When creating a new collection, the users and groups already assigned to the applications should dynamically be used for the Users and Groups for the collection itself.
I don't see how the two would be different.
Kiki Simpson commented
Thanks for the feedback! We have it as different lists today because an admin may not want everyone who has access to Dropbox, or another app, to have access to the specific collection they're putting together.
I've made a note of the request though and will look into some options we could make for admin who would like that behavior.