Vault injector secret-volume-path annotation

hi,

i am using the vault injector to make secrets available to kubernetes pods.
in this case i am trying to read the content of a root ca from vault.
i want to save the secret in the folder /etc/ssl/certs/root.pem where all other needed certificates are located. when working with the secret-volume-path it removes all of the content in the folder and just adds the root.pem file with the corresponding secret.

what am i missing? there must be away to just add this file?

thanks in advance.