Who sends the certificate, the client, the server, or both? a certificate is sent by one party to let the other party authenticate that it is who it claims to be. based on this usage, you should be able to guess who sends the certificate and check the messages in your trace.

Both the server and the client send certificates

Explanation:

In a given network session the server sends a certificate to the client . The client is able to verify that the server's identity, the authentication uses a public encryption key and a digital signature .The client in turn retrieves a private key they can use to create a digital signature . A certificate is then sent by the client across the network to the server and it uses it to authenticate the client's identity . Once the server has confirmed that the client is who they say they are it grants access for the verified identification.

add the following answer

im not sure what your file type is. is it a .zip file