Hey! Figured it out. Somehow my update for Animal Crossing itself was corrupted. The game showed 1.1.0 but was effectively running 1.0.0. If anybody else has this problem, delete the update data, and reinstall it. Should fix it.
Yeah, I was using CyberDuck on mac initially. Tried Filezilla in Binary mode and it still didn't work.
I sold the Switch and am trying to restore the save on a different device, so the guy is waiting to wipe my Animal Crossing save until I can get it working. :(
Hey! I'm trying to use JKSV to move an Animal Crossing save file from one Switch to another. When I restore it and load the game, ACNH starts up saying the save data is damaged. It properly named itself, and I did a batch backup and it's not working. Any advice?