My experience of the notifications on iOS Is that, with up to date releases:
- the red dot on the icon Is not possible to activate (maybe I didn’t find how to do so?,
- on the chat: you have to specifically specify a group or a person in each message for him to be notified.
For the red dot at least, it seems to be ok on Android, but I have not in depth experience yet.
Does anyone have other and more complete experience on iOS?