In your first screenshot, you see the HomePage.html resource under Shred_Bag_Charts. Look at that resource to see where IT is getting the file. If that resource is a simple mount, then the file path will be right there in the configuration. If that resource is a doGet script, you would look at what its script does, and replicate that in your main resource.
I strongly recommend that you have your script resources be one-liners pointing at a project library script function, passing the given arguments. That also allows you to share common code among multiple callers. Also:
Please see Wiki - how to post code on this forum.