Does BCC functionality only work if you send emails from within Monday.com app?

Hello,

When using the BCC email functionality to track outgoing emails, will this only work if you send the email from within Monday.com itself - or will it also work if you send the email from your email provider (in my case Gmail)

I have just tried the latter and the correspondence isn’t appearing attached to the contact as I expected - is there a time lag before it works or will it only work if I send the email from within Monday itself?

Thanks in advance!