Dolphin Core How read Memory Card B?

Hello. Thanks for reading my topic. I have copied the memory cards files in path /save/dolphin-emu/User/GC/USA/Card A/

The memory card 1 is loaded correctly. I have created the path /opt/5 Computer Games/2-00 LibRetro/NVRAM/dolphin-emu/User/GC/USA/Card B/ and copied memory card B 2 files and not are loaded in any game.

How read data from memory card B 2 ?