Hi Mary Christie,
I haven't checked your account yet, but I wanted to confirm if the client setup a contract for this test work? Please know that requesting for free test work is a violation of the Upwork User Agreement.
Since you are new here, I would recommend that you read these tips for avoiding questionable jobs and the freelancer resources for more information about working safely through Upwork
re: "...then he asked me to transcribe the 1st 5 minute of a recording as a test. Is this OK?"
No, it is not okay.
The client is violating Upwork's rule that prohibits clients from asking freelancers to do free work.
Try going to a nice restaurant and asking them if they will serve you a meal and let you eat for 5 minutes as a test. If you like the food, you will continue eating it and pay for it, but if you don't like the food, you get it for free. See if the restaurant thinks that is okay.