I get An error occurred, error code: -2 when I try to upload an audio file. What do I do?

This error means that the file cannot be uploaded to the website because it has an incorrect format. Please try converting the file to an MP3, even if it already has that extension.

To convert files, you can use:
www.online-audio-converter.com/ru/ (vk.com/app3060602),
or this convenient free application www.pcfreetime.com.
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