yast2-ftp-server from SUSE:SLE-15-SP3:Update project
Select Your Operating System
Add repository and install manually
For pool run the following as root:
zypper addrepo https://download.opensuse.org/repositories/SUSE:SLE-15-SP3:Update/pool/SUSE:SLE-15-SP3:Update.repo zypper refresh zypper install yast2-ftp-server