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Welcome to the file-upload-types wiki!

The plugin has a filter file_upload_types_strict_check to override the stricter mime type check since WordPress 5.0.1 where the file content and file extension must match.

Use Case Examples:

1. Avoid strict check for .asc extension.

add_filter( 'file_upload_types_strict_check', static function ( $bool, $ext ) {
	return $ext !== 'asc';
}, 10, 2 );

2. Avoid strict check for an array of extensions.

add_filter( 'file_upload_types_strict_check', static function ( $bool, $ext ) {
	return ! in_array( $ext, [ 'asc', 'woff', 'ogg', 'webp' ] );
}, 10, 2 );

3. Avoid strict check for all extensions.

add_filter( 'file_upload_types_strict_check', '__return_false' );

** Please note that disabling strict checks can potentially be misused.