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I tried to upload a .mp3 file and wordpress rejected and display message:

Sorry, this file type is not permitted for security reasons.

This happened with some .mp3 file only. I'm using wordpress 4.9.6

1 Answer 1

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you need to allow them to be uploaded in your media files.

you can add following code to your themes functions.php

function my_mime_types($mime_types){
    $mime_types['mp3'] = 'audio/mpeg';
    return $mime_types;
}
add_filter('upload_mimes', 'my_mime_types', 1, 1);

there is more information about adding new mime types in WP here: https://wpsmackdown.com/add-remove-filetypes-wordpress-media-library/#add-filetypes

And here a list of the mime_types: https://feedforall.com/mime-types.htm

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  • When I checked the code, I found out that the mine_type of the file is >application/octet-stream Is it wordpress bug?
    – minhbh
    Oct 24, 2018 at 10:33
  • you are right. you can use application/octet-stream. it's a official one or also audio/mpeg should work. updated my post... Oct 24, 2018 at 10:37

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