[...] I can't only select "Check now", [...] I connect my ledger, enter the pin, it's unlocked, but nothing is happening on the ledger live, and I can't continue.
There seems to be some of kind of connectivity problem between your Ledger and PC. I would try doing something as simple as rebooting the computer. Some other app in the background could be interrupting the connection.
Oh right, the USB got disconnected. That's it I'm good, thanks so much for the help!
btw
what's the difference between segwit and native segwit?