Symbols in Multi-Step Sequences?

(Similar to my question about Annotations.)

I'm creating a multi-step repair sequence in Creo Illustrate 3.

I want to have a Symbol be visible for the duration of one step. If I try to delete it or hide it in the next step, it disappears from the previous step, the now-current step, and all subsequent steps.. If I do nothing, it remains visible in all subsequent steps!

Going one step further, I have some product photographs that include features not shown in the Creo Parametric figures. I can add the photos (in png format) to the Symbols library, but I'd like to use a single photo as a single step. Can this be done?

There's got to be something simple that I'm missing here!

Ideas?

Tom Burton