highlighting within a scroll region
I'm putting together a lesson in storyline in which I am using a scrolling window for a long text section. I want to highlight key words AFTER the learner has read it completely. The trick is that I want to go word by word, in sequence, and I'm having a hard time putting this together. I was trying to highlight words with layers, but I can't (un)highlight the words in the base layer using a trigger, right? I also tried using a text box, but it won't stick to the word selection. Any ideas? My only other option is to highlight all the words on the next slide? That won't highlight in a sequence, though. Help!