Can't find YAML file via code (though it exists in /app)

I don't know why. Where is the YAML file supposed to go? I've tried
placing it in /app, /public, /views/, /views/lpl_short_form_apps (the
view where the YAML file is being called to load).

Can anyone assist?

Rather than guessing where it is, have you tried printing out the
value of YAML_CONFIG_FILE ?

Fred