It is a pain, I work with clients who publish their own courses and they have to reattach all the published files.
I think SL1 and SL2 it was stored in the file but always seemed to break on updates.
It is a pain, and I'm sure it used to store the files.
At the very least, StoryLine should give a pop-up warning on Publish, telling you that some Resource files could not be found. They are attempting to copy the file during Publish so they could easily issue a warning.
Preferably, I would want to see both a warning of missing files, and an option to include resource files with the .story file.
