So I don't do anything special with the formatting when I import, like I have just left the settings as the default and it's worked fine importing into native decker.
I saw in the other thread you were having issues that I guess you fixed by using web-Decker, but if native Decker isn't taking regular WAV files, that could be something worth figuring out since it seems to work fine for me at least. May I ask what OS you are using? Could be like something platform-specific?