I have a Ledger Nano X, which, as you probably know, does not really “support” ADA; granted, Ledger wallets have a Cardano app, but one cannot really “send” their ADA to that app - hence the need for Yoroi. Anyway, after I got my Nano X, I wanted to get my ADA out of my Binance account, so I created a Yoroi wallet, which, by default, was identified as “Shelley - Ledger wallet.” With the word “Ledger” in it, I figured this was where my ADA should go, so I sent all my ADA from my Binance account to this “Ledger” wallet. Everything went just fine … except that I was never given any 15 seed words when I set up the “Shelley - Ledger wallet” or afterward, when I sent my ADA to it.
Now, the strange thing is that, a few days later, I was playing around in my Yoroi app, and realized that I could create a second wallet. I did so, and the one that got created was called “Shelley - Standard wallet” (I still have no idea what the difference is between the “Ledger” wallet and the “Standard” wallet) and when I did I was given 15 seed words. So, now I am wondering if I made a mistake storing my ADA on the “Shelley - Ledger wallet” (which I only did because it had the word “Ledger” in it) rather than in the “Standard” Yoroi wallet.