Embedding Local Content on a Intranet site?

I'm struggling with this issue as well. I want to create a library of screen shots from our application that will automatically update in all our courses when they are changed, but those screenshots can't be hosted on a publicly accessible website because it's proprietary software. This leaves out embedding screenshots entirely, since the only place I can host them is on our internal network. Our LMS has an asset library feature, but even though anyone accessing the course would be able to access the LMS-internal asset library, I can't embed the asset because Rise and Storyline can't "verify" the URL.

We have a lot of screen shots, and a lot of different training modules that require them. Manually updating every training when a screenshot changes is a laborious task.