Ticket #57775: 57775.diff

src/wp-admin/includes/class-custom-image-header.php

@@ -876 +876 @@
                          * @param string $file          Path to the file.
                          * @param int    $attachment_id Attachment ID.
                          */
-                        do_action( 'wp_create_file_in_uploads', $file, $attachment_id ); // For replication.
+                        $file = apply_filters( 'wp_create_file_in_uploads', $file, $attachment_id ); // For replication.
 
                         return $this->finished();
                 } elseif ( $width > $max_width ) {