better put, Did you create a v1.0.0 database or did you create an EMPTY database.Not sure what you mean by injecting them. I used Cave and made the file and put it on my switch. Not sure how to inject them?
Did you even add a .gb, .gbc or .gba rom to your database and click save? File/add game and then import rom!
Did you copy the folder to the correct spot?