Pokemon Stadium 2: Transfer Pak failing in Retroarch on the Switch

[symphonic5]

I've been trying to get the Transfer Pak working in both Pokemon Stadiums 1 and 2 in Retroarch on the Switch. The transfer pak option is enabled on the controller.

I've tried both methods to get the game to recognize the files:
1: Putting the N64 rom, GB rom, and GB save file in the same folder, all named the same.
2: Loading the core, and loading the three files through the subsystem option.

Either way, either game, I get the error "The Transfer Pak is not set properly. Please turn the n64 Control Deck OFF and check all connections."

Both Stadiums see the Game Boy game, the icon is there! I just can't get any further.

I feel I am so close!

Help!

Thanks.