I have tried this method, but I don't know why the software cannot respond. (I'm not sure if it is expressed like this in English, or is it stuck?)
And I have tried long audio and short audio, and also changed to wav format, but it didn't work.
I checked the program. It currently supports the WAV format only. You can use Audacity to convert your sound file to the WAV format before replacing the alarm sound. Hope this could help.
