Paths in blueprints

I’m referencing a file (FM_Barn.png) via a path in blueprints. I realize that the path changes in the packaged file. My question is how to I set up the path for the packaged file?

I’m using a plugin that calls an image file with paths in an example BP (below). The more I research, the more it seems that an external file can only be called in editor and not in build. Can anyone confirm that? I’m not getting a response from the plugin developer.