Since proppilot.fr is a root (apex) domain, you cannot use a static A record pointing to an arbitrary IP. You need to create a CNAME record pointing to the Railway-provided value (02csisy1f.up.railway.app), but this requires your DNS provider to support CNAME flattening or ALIAS/ANAME records at the apex level. If your current DNS provider doesn't support this, you can move your nameservers to Cloudflare, which handles CNAME flattening automatically.