I'm actually working on an update to the entire package that I plan on releasing soon here. That one should be easier to configure. In the meantime, you just have to make sure propane can be both dumped and loaded to/from the dryer placeable, and make sure your xml entries are correct. Check your log for any issues/errors, even if they seem unrelated to Advanced Addon itself.
Viewing post in Propane
Forgive me for being dumb, it's been ages since I've modified anything(since fs13) correct me if I'm wrong, but if I remove anything related to propane in your items could that work?
I would like to add this system to JCLS bins and some others to make an old fashion system for drying by fans type so I wanna get things right the first time before trying and not break everything.