Maybe it's just me, but I honestly find it a bit of a pet peeve that I'm unable to see updates on my Explorer Tab when I add new files and refresh.
Incidentally, this happens to be a characteristic that is true only when your project folder is accessed through the Favorites filter (as discussed in this thread). Members in the thread have astutely surmised - favorites seems to save a "Snapshot" of the time you Favorited that particular folder.
https://www.vegascreativesoftware.info/us/forum/explorer-refresh-doesn-t-refresh-bug--112072/
While some people accept this, I personally find it to be an odd hindrance. At the very least, can we get a refresh button that is dedicated for favorites if its not something that can be easily addressed?