Alignment

Hi Mona. Yeah, this is a tricky one. The solution is relatively easy but it's still not mathematically perfect.

I see that your image frame is the default shape when it is converted to a Parallelogram.

Simply create another shape, preferably the Parallelogram option, but you can always create a rectangle and change the format after the fact.

Align the bottom-left point of your new shape to the bottom-right visible point of your image (not its boundary box). It doesn't have to be pixel perfect (ideally, it would be awesome if it could be).

Reduce the opacity (or increase the transparency) of your new shape so we can see the image behind it. We are going to have to manually align the angles because, as you are well aware, Storyline doesn't allow us to make precise measured specifications of our angles or corner radii, etc, etc, etc.

Now we simply slide the little yellow dot (by zooming in REEEEEEAAAAALLLLLLY close) and shift it forwards and backwards, occasionally having to zoom out to see if it roughly aligns with the angle of the picture frame.

And, voila, after ages of trial and error you now have an approximately accurate parallel Parallelogram.  Be careful when you realise that, damn, you wanted the shape to be bigger, because if you drag the shapes handlebars the angle will distort accordingly.

You will just have to manually drag the yellow dot along till you get it right.

Here's you file back with these shapes embedded. I hope that helped.