Use on your PS2 to copy the file from mass:/ to mc0:/ . For PC (PCSX2 Emulator) Locate your memcards folder in the PCSX2 directory.
The game provides 20 save slots that are shared across all available game modes. Save Data Resident Evil 4 Ps2
If you need to manage saves from the PS2 main menu: Use on your PS2 to copy the file from mass:/ to mc0:/
Unlocking Everything: A Guide to Resident Evil 4 PS2 Save Data Save Data Resident Evil 4 Ps2
: Emulators like PCSX2 (PC) and AetherSX2 (Mobile) use "Virtual Memory Cards" (.ps2 files).