Use the tool to copy your save from the physical card to a USB drive as a .psu file.
If you still have your original PS2 hardware, you can bring your childhood memories to the emulator. Use a PS2 with installed. memory card save file for pcsx2 ps2 better
Point your PCSX2 memory card directory to a Dropbox or Google Drive folder. This provides an automatic version history of your saves. Use the tool to copy your save from
How to Optimize and Manage PCSX2 Memory Card Save Files for the Ultimate PS2 Experience memory card save file for pcsx2 ps2 better
Use the tool mentioned above to import that .psu into your PCSX2 directory.