I am still getting “X.epub: Sorry, this file type is not permitted for security reasons” despite adding:
define('ALLOW_UNFILTERED_UPLOADS', true);
to my wp-config.php.
Of course, I have allowed this type of file in my blog network’s configuration:
Is this a normal situation (and using filters is the only workaround)?
Or this is something weird (like some plugin or theme overriding this) and you should keep looking for a possible cause?
EDIT (after comments and some more testing): This is .epub files-related only issue. I was able to verify that ALLOW_UNFILTERED_UPLOADS is working. The thing is that when it is enabled, it passes through all but .epub files. So, for the above screenshot, I was able to upload .azw3 and .mobi files. Out of all listed in “Upload file types” above only uploading of .epub files fails.
EDIT: This is my private blog network and I am logging via a super user account when using it.
Answers:
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Method 1
You probably need to allow the mime types for them to be allowed to upload.
https://www.robertwent.com/blog/adding-custom-mime-types-for-wordpress-uploads/
//The following goes in a themes functions file or a custom hooks plugin
function so_387865_custom_upload_mimes ( $existing_mimes ) {
$existing_mimes['epub'] = 'application/epub+zip';
$existing_mimes['mobi'] = 'application/x-mobipocket-ebook';
return $existing_mimes;
}
add_filter('upload_mimes', 'so_387865_custom_upload_mimes');
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