M4A files can currently be imported - is there something specific about the format of those files that may be an issue? Can you please forward one (or a link) to email@example.com? Thanks.
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I sended to firstname.lastname@example.org, thanks for answer
I was able to import that file you sent without issue... the file itself seems problem-free as well. Can you give me any more information on where the file might be located (path too long?) or other details?