I take it that “Signed 32 bit PCM” means “Signed 32 Bit Int”, as there is a “32 bit Float” – why not call it “Signed 32 Bit Int”, as the “32 bit Float” is also PCM, right?
It also struck me as odd that there was no 24000 Hz sample rate.
Raw import only works with PCM where the file is a series of samples and each sample value represents the wave amplitude at one instant in time.
If you import a compressed file as raw data it won’t get decompressed/decoded. The data doesn’t represent individual samples but it will be converted directly to samples and you’ll get garbage/noise.