I am checking on this.

Sorry for the delay on this.  I have not had a chance to test this in my lab and engineering did not test this using a public certificate.  Backup or take a snapshot before trying the following.

1. SSH to the Filr 23.4 server
2. Access File /opt/novell/filr/apache-tomcat/conf/server.xml
3. Search for line '<Connector SSLCertificateChainFile' & comment the whole line <! -- -->
4. Replace it with following line
   <Connector SSLCertificateChainFile="/vastorage/conf/certs/vachain.crt"
           SSLCertificateFile="/vastorage/conf/certs/vaserver.crt"
           SSLCertificateKeyFile="/vastorage/conf/certs/vaserver.key"
           SSLCipherSuite="TLS_AES_256_GCM_SHA384,TLS_CHACHA20_POLY1305_SHA256"
           SSLEnabled="true"
           SSLPassword="changeit"
           SSLVerifyClient="none"
           SSLProtocol="TLSv1.3"
           URIEncoding="UTF-8"
           maxParameterCount="1000"
           maxThreads="250"
           port="8443"
           protocol="HTTP/1.1"
           scheme="https"
           secure="true"
           server="Filr"
           sslEnabledProtocols="TLSv1.3">
</Connector>
5.  Restart the Filr service

Test to see if you can access the 8443 page.  If yes, you can validate TLS 1.3 access using following command:

openssl s_client -connect FILRSERVERNAME:8443 -tls1_3

I will try to test this in my lab as well.