Please convert that file to mp3 format by using this online tool:
https://online-audio-converter.com/
and then give it another try.
At the moment we have an issue importing m4a files, but we are working on it.
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ok thank you , bit of a problem becuase when you download from notebook lm it is a mp4 at the moment it works as a mp3
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I was having that issue too, however. I had to convert all mp4 files into mp3 then it worked. This is extra work on user end. Well, it is what it is.
@asad100101 It is an extra work. However, we are looking into this and we will have it sorted out soon.