Having automation problems

I’m using Logic Pro X. I’ve listened to Mike’s YouTube video “Amazing CC Automation Secrret…” (Amazing CC Automation Secret in Logic Pro X - YouTube).

So, in my composition, I selected my cello track and opened up the step editor as described in the video. However, it makes no difference if I make changes to modulation, expression, or volume, nothing changes on the track. The cello plays the same regardless of any changes.

I tried doing the same thing on my analog pad track and get the same result; nothing changes.
I’ve tried making the changes in both “read” and “latch” modes but to no avail.

What am I doing wrong? Seems to work beautifully in Mike’s video.I’m stumped. Any suggestions would be greatly appreciated.