Exchange 2013 certificates

So, I’ve tried the steps and created a SAN certificate for my five email domains ( and for each) using POSH, but I’m pulling a blank as to how to import them into Exchange 2013. It looks like what I should have done is have Exchange generate the certificate request and then use that somehow with POSH to have Let’s Encypt create the certificates, then import those into Exchange. Can anyone step me through the process?

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