iOS Question Create Push Key for FirebaseNotifications

I am following the tutorial but I have problems in Step 4

4. There should be a file named aps_*.cer in the keys folder.

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I have only the file aps.cer, created as shown in video position 2:36. Now trying in IDE Create Push Store / Firebase Service I get error: "There should be exactly one aps certificate file". Now I read in an old post, to rename aps.cer into aps_production.cer. But this gives me the same result.

What I am doing wrong?