I tried several times to upload an MP3 file to create lesson. While the website correctly receives the file and the file plays correctly in the preview, the adding of the lesson fails with the error message : “The file you uploaded was not an audio file in supported format. “ .
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Sounds like an issue with that specific audio file. Can you try to reconvert it to mp3 by using this online tool: https://online-audio-converter.com/
and then give it another try.
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