Publish internal news or announcements

I would like to place ads or news, is there a plugin that helps me with this or do they have a way to keep users informed. That is, for a server restart or other types of issues.

Have you tried-out the announcement app?

If so, do I look for it in the app store?

yes, that should always be the first source for available apps:

Is there another form of ads? to appear on the entire screen?
How can I make the notification have sound? It’s active in settings but it doesn’t make any sound.

same question. me too want announcements in entire screeen. is there any way to do this?

Afaik, this is usually a setting in the users web browser to allow to receive notifications and if a sound should be played.