So I just bought the Kiai item today. I took a clip from "Battle Cry" by Imagine Dragons and exported it to a .wav file on Audacity. When I try to upload the file into the item, the button looks like it works but nothing happens. Halp!

This is the file I'm trying to use.

Did you download as an mp3 and change the extension to .wav? If so toit doesnt work that way
is it 5 seconds? Kiais are 5secs or less
Did you use a Conversion site. If so don't.
Import file into Audacity, then export as a .wav (faster and more reliable with no virus)

If the above doesn't work, then I'll try it out.

When you upload it, it normally looks like nothing happens, even if it's uploaded, otherwise there are error messages.

Try to /dl spectretro ingame and fight an online match, pretty sure it should work.

the file should be below 5 seconds and you should dl yourself again like what zwouter said

mine wont work ingame either ):

So I did all the things you guys said, but the button just doesn't seem to do anything. It just turns blue, there's not processing, or message, and the file name is still displayed.

button? You mean pressing play? Try clicking on the name of the file on the site.