timeline animation question

I'm trying to emulate something I do in Flash on a regular basis, but can't seem to emulate in Storyline.

I have a single .png image file I've imported. As the timeline moves, I need to zoom up the image to display parts of it larger, then zoom it back down to be able to see the whole file. In Flash I could do this using one layer and tweening the image size. In Storyline, it seems that I'd need to create a layer for each zoom size and then cross-fade them to approximate the zoom.

Is there a better way to make this happen in Storyline?

Thanks.

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