Find the Attack on Titan file you downloaded (it will likely be compressed as a .zip or .rar file). Tap the file and select .
Attack on Titan (AoT) on an Android device via the PPSSPP emulator, you generally use fan-made modifications or "mods" of existing PSP games, as there was never an official standalone AoT release for the original PlayStation Portable hardware. Instead, the community has developed Download Game Attack On Titan Ppsspp Android