No, I'm definitely not selecting more than one ( you can tell by the highlight), I spent several hours on this, many different ways...
I guess you can't link multiple thumbnails from the same source.
Is there a phone number I can call?
It's very disappointing when you buy mid-high end software, thinking you are getting something that works, yet it doesn't.
The manual has zero info on thumbnails related to this, as does the on-line help.