The PS5 and PC release of Final Fantasy 7 Remake had DLC content that can't be played on PS4, but it's actually a surprisingly necessary add-on, as it includes important story information that's relevant to Final Fantasy 7 Rebirth. The FF7 Remake INTERmission DLC stars the impetuous ninja Yuffie Kisaragi, following her on a covert mission to infiltrate Midgar during the events of FF7 Remake. Yuffie is the only playable character in her DLC, though there is a guest party member called Sonon, who fights alongside her throughout her story.

https://screenrant.com/final-fantasy-ff7-rebirth-play-intermission-dlc-first/