Hi DylanDarling they may blur if the Storyline course scales up. For example, you have your slide size defined at 1920x1080 and view the course on a larger screen allowing the course to scale up in size beyond the author size. Any graphics within the module that are not vector based will start to degrade if they are scaled up beyond their original size, or are scaled down beyond their original size.
If this is the issue, there isn't much that can be done about it, especially if you are working with screen shots.
I have been able to address this issue with assets where I have control over the exported size from tools such as photoshop, figma, illustrator etc. I export at x2 the original size, and then when I insert into Storyline, I set the size at 50% to get to the correct size. This seems to allow the image to scale much larger without losing quality. I always make sure I optimise compression though, otherwise file sizes can blowout.
