Uploading Storyline SCORM file into LMSPortals

Hello,

I am trying to upload my Storyline SCORM file into LMSPortals, but for some reason, the sizing of the content is smaller than when I upload content with Rise 360. 

Here is an example of what it looks like uploading a Storyline file:

As you can see, the actual content is small and has black around it.

Whereas, with Rise 360, the whole black part is filled in:

How do I get the Storyline size bigger naturally? I know you can 'zoom to fit' within LMSPortals, but then it is too big. Is there a feature when downloading to make sure the size will fill up that whole black area?

Thanks,

Bri