We re-saved your audio file with a more friendly encoding option which allows to see the curve in our software. (made with the software "Audacity": WAV > Encoding > Signed 16-bit PCM")
And the result with this file looks quite good (in our opinion):
https://youtu.be/er2HPOX45GQYou will receive via "wetransfer" the download link to the "new WAV format" audio file by email.
Please try with this new audio flie and let us know.