Try adding an action under Whenever Shown to query a model. Query the model that your chatter feed component is on and it should now show updated data for that model whenever you go to the chatter tab.
Did you get this to work? I’ve tried requerying the model and the chatter component doesn’t show posts that were created since the last time the model was queried.
Ah, young me from many months ago. As a matter of fact I didn’t get that to work. I think at the time I didn’t realize that the Chatter component works differently than other components and unfortunately does not refresh based on model changes. Sorry for the mislead, but you’ll have to put the Chatter in an iframe in a template and refresh it that way