Draytek Vigor2620 LTE Series User Manual page 242

Available settings are explained as follows:
Item
Upload Local Certificate
Upload PKCS12
Certificate
Upload Certificate and
Private Key
230
Description
It allows users to import the certificate which is generated by
Vigor router and signed by CA server.
If you have done well in certificate generation, the Status of
the certificate will be shown as "OK".
It allows users to import the certificate whose extensions are
usually .pfx or .p12. And these certificates usually
need passwords.
Note that PKCS12 is a standard for storing private keys and
certificates securely. It is used in (among other things)
Netscape and Microsoft Internet Explorer with their import
and export options.
It is useful when users have separated certificates and private
keys. And the password is needed if the private key is
encrypted.
Vigor2620 Series User's Guide