The Steelers activated Porter (back) from the active/PUP list Sunday, Teresa Varley of the team's official site reports.
Davis remains as the top reserve running back in Dallas behind starter Javonte Williams following the reported cuts of Jaydon Blue and Phil Mafah, Patrik Walker of the Cowboys' official site reports.
The Steelers traded Jones and a future fourth-round draft pick to Dallas on Saturday in exchange for future third- and sixth-round picks, Adam Schefter of ESPN reports.
Trigg (toe) failed to haul in any of his three targets during the Cowboys' preseason loss to the Saints on Friday.
Brown caught one of his two targets for 27 yards during Dallas' preseason loss to the Saints on Saturday.
Smith caught three of his four targets for 19 yards during The Cowboys' preseason game Friday versus the Saints.
Mafah rushed 12 times for 46 yards in Friday's 27-24 preseason loss to the Saints.
Milton completed eight of 15 passes for 92 yards and rushed twice for two yards in Friday's 27-24 preseason loss to the Saints.
Aubrey made three of four field-goal attempts and converted his lone PAT try in Friday's 27-24 preseason loss to the Saints.
Liufau broke his left forearm during the Cowboys' 27-24 preseason loss to the Saints on Friday, Todd Archer of ESPN.com reports.
