How to issue a Cloudflare Origin Server Ceritificate

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Did you follow the instructions here Origin CA certificates · Cloudflare SSL/TLS docs

Step 10 clearly states:

Copy the signed Origin Certificate and Private Key into separate files.

With these go to https://SERVER_URL:8090/websites/mywebsiteforcf.com

Click on Add SSL and add Origin Certificate on the left and Private Key on the right