Put Amiiswap.nro here:
Micro sd card /switch/Amiiswap/Amiiswap.nro

WARNING: Old json files will crash Amiiswap so you need to generate new amiibo files using emuGUIibo from here:

https://gbatemp.net/threads/modded-emuguiibo.548485/

New created emuiibo files created with modded emuGUIibo go in this folder:

Micro sd card /emuiibo/amiibo/(amiibo folder with json files)