Tutorial of enable SNMPv3 on vCSA 6.7

I found this > Configure vCenter Server Appliance for SNMP v3

And now stuck at configure SNMP users when run "snmp.hash --auth_hash secret1 --priv_hash secret2"

I input plain text for <secret1> and <secret2>. This works when execute this in the shell of ESXi. But in the shell of vCSA. It shows

Error in method: Invalid path to secret file. The file must be a plain text

file containing the secret to use to generate hash. (code

com.vmware.applmgmt.err_snmp_bad_path)

The guide did mentioned the prerequisites include "store these passwords in files on the host system".

But what kinds of file (format) should I create? Input the plain text password in those 2 files? Where should I place those files in the "host system"?