The string you're referring to, "Persona.3.Reload.CUSA37521.CUSA37522.DLC.Pack,"
Official DLC Guide for Persona 3 Reload – A complete breakdown of every official DLC (costumes, Personas, the Episode Aigis expansion), what each adds, and how to access them after purchase from the PlayStation Store, Microsoft Store, or Steam. Persona.3.Reload.CUSA37521.CUSA37522.DLC.Pack.v...
Activation: In Persona 3 Reload, once the DLC is installed, you must go to the closet in your dorm room to "Check the Box" and claim your items. Troubleshooting Common Issues The string you're referring to, "Persona
Costume Sets: Outfits for characters based on other games in the series, such as Shujin Academy or Yasogami High uniforms. Expansion Pass : Episode Aigis is accessed from
Expansion Pass: Episode Aigis is accessed from the main title menu rather than within a current save file. Why the Versioning Matters
It’s also important to note that the DLC Pack generally contains cosmetic and "power" items, while the Expansion Pass (released later) is what contains major story content like Episode Aigis: The Answer.
Ensure your PS4 is on a compatible firmware (e.g., 9.00 or 11.00). Install the (CUSA37521 or CUSA37522). Install the Update v1.xx (Required for DLC compatibility). Install the DLC Pack PKG