not a valid audio url - what's wrong?
Yes, as @JFC wrote, looks like this audio is in m4a format. LingQ can only support mp3 files at the moment.
Okay, then it's not solveable, they don't offer a mp3 file. Thank you both for the help!
Download the file and then use an online converter to convert it to mp3. Then upload it to LingQ.
I've not used this particular one, but it came up in a search:
I hope LingQ will support other common codecs besides mp3 in the future. aac/m4a should play on any platform LingQ supports anyway.
The audio has to be MP3.