While watching the impeachment hearing with Ambassador Taylor, I sometimes heard committee members ask to enter articles (e.g. opinion articles from the New York times or an article from Politco) into the "Congressional Record". Sometimes members making such a request would mention the term "unanimous consent". A few times, I heard committee chairman Schiff reply "without objection" and sometimes requesting members would reply to that with a simple thank you.
It's not clear to me what this procedure entails.
Firstly, it seems the committee chairman can overrule the unanimous consent and simply agree.
Secondly, it's a bit weird to me how brief these interactions are as the hearing will simply continue the hearing. What happens when the chair agrees to enter something into the Congressional Record? Does it simply appear on some congressional website or is there something more to it? Is the document associated with the specific hearing, the specific committee, or some general record?