Jenkins multiproject repository

Hi my project on github looks like :

• Backend
  • gateway-server
  • authorization-server
  • services
    • restaurant-service
• Mobile
• Web

I tried to connect Jenkins to gateway-server.

If I have Jenkinsfile on main folder(on repo) it is work.

I tried path /Backend/gateway-server, /Backend/gateway-server/, Backend/gateway-server, Backend/gateway-server and no one work.

Try first gateway-server, meaning a path Within the currently checked-out repository (Backend)

That might be enough to sparse-checkout that single folder.