For example, I select some requests from a collection, order them as I wish, then can I just save all the requests along with the ordering, configuration, etc, so I can easily run again? I don't find any 'Save' button on the 'Run Collection' page.
For those who might be seeking the same goal, Postman has this beta feature called 'Flow'. It's still not full-fledged and not very convenient to use. But it can do things.