Expert RAW app is a must-have for Samsung Galaxy devices. it supports almost all flagship models like Galaxy Fold 5, S22 Ultra & S23 Ultra. Still, some devices do not support this app and such a series is a fan edition. Yes, the Expert RAW app is not available for the Galaxy S21 or S23 FE series. In Galaxy S21 FE, both the Exynos edition and snapdragon 888 edition do not have Expert RAW app support.
Some users think the Galaxy S21 FE Snapdragon 888 variant is new in the market so the app will run on it. In this matter, Samsung officials have clearly mentioned Snapdragon edition too excluded from the support. It would be best if you kept in mind this when you want to purchase the new fan edition variant.