How to Fix the “Sorry, This File Type Is Not Permitted for Security Reasons” Error in WordPress

add this code in functions.php

function my_custom_mime_types( $mimes ) {
 
// New allowed mime types.
$mimes['svg'] = 'image/svg+xml';
$mimes['svgz'] = 'image/svg+xml';
$mimes['doc'] = 'application/msword';
 
// Optional. Remove a mime type.
unset( $mimes['exe'] );
 
return $mimes;
}
add_filter( 'upload_mimes', 'my_custom_mime_types' );
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