Auto Image re-size and inserting equations

Hi there

I am wondering if there's a way to turn off the auto-size when you're inserting an image? When I try to insert images they automatically seem to stretch to fill the space when in reality I want them the size I created. 

This happens with regular images but also for when I am trying to insert equations into storyline. I have been using PPT to create my equations, then I save them as images with transparent background. I set them to be the correct font and size I need for my standard but then when I go to put them into storyline it's auto-stretching them to fill the space regardless of what my original size started as. 

Trying to fix this in storyline is difficult and I end up with various sized equations. lol 

Thanks for any insight. 

Suggestion for future Storyline development: in house system for building equations ;)