Decompress that MP3 to WAV.
Also adjust other parameters if needed.
To import and work without any issues it has to be a 44100Hz 16-bit PCM WAV file.
Some MP3s work too, but you need to experiment to see exactly what type of compression and so on. So instead of re-compressing which will lead to loss of quality, just decompress.
turning it to a wav file worked thank you ^u^