How to add a custom tile to access any external application on SAP Fiori Launchpad in S/4 HANA Cloud system
S/4 HANA Cloud Platform
There is no Fiori Launchpad Designer in S/4 HANA Cloud system.
You can use "Custom Tiles" app.
Please refer to next document.
KBA , BC-SRV-APS-IAM , Identity and Access Management , How To