Attaching file into Storyline

How do we attach files into a storyline module and keep the attached file in the storyline file?

It appears when we put 'open file' trigger and points to a file, the absolute path is recorded; then when the .story file is moved to another folder, or being restored from an archive to be edited by the next unknowing developer, then subsequently published, Storyline does not check if referenced files are properly attached or not, there is no warning or error. Later during playback, the user will encounter the error.

I was suggested to use the player's resource attachments, by turning on the player, attach the resources, then turn off the player again then use the .\story_content\external_files\filename workaround. 

Is there a better way to do this?