Solved, read edit.
Still need help figuring out this issue.
I've got my item semi-working in-game (See here to know why it's only 'semi').
Other then the problem from my other thread, I can't seem to get a sound to work on the item.
I created an .ogg file in the shared\sounds\items folder, but it didn't work.
In my items item.entity file do I need to add a line:
Or something like that?
This is starting to make me a little :madm:.
EDIT: For others who may encounter this problem, the sound has to do with the state.effect file.
For my potion, all I added was this:
Obviously replacing YOURSOUND with the filename of the sound you want.