I didn’t know that was there either, @listentwice.
I notice that the group names I had saved in the open dialog are also accessible here. Although If I specified resources in a list in the open dialog, choosing that list does not attempt to send/receive the resource, which is not possible. Opening a group you’d saved in Open (or in “Modify text collection”) in the send/receive “select text” ignores any resources that were in the saved group.