diff --git a/wp-admin/includes/class-custom-background.php b/wp-admin/includes/class-custom-background.php
index b818016b28..2eb3ccfd64 100644
--- a/wp-admin/includes/class-custom-background.php
+++ b/wp-admin/includes/class-custom-background.php
@@ -571,8 +571,9 @@ class Custom_Background {
 		$thumbnail = wp_get_attachment_image_src( $id, 'thumbnail' );
 		set_theme_mod( 'background_image_thumb', sanitize_url( $thumbnail[0] ) );
 
-		/** This action is documented in wp-admin/includes/class-custom-image-header.php */
-		do_action( 'wp_create_file_in_uploads', $file, $id ); // For replication.
+		/** This filter is documented in wp-admin/includes/class-custom-image-header.php */
+		$file = apply_filters( 'wp_create_file_in_uploads', $file, $id ); // For replication.
+
 		$this->updated = true;
 	}
 
diff --git a/wp-admin/includes/class-custom-image-header.php b/wp-admin/includes/class-custom-image-header.php
index 9df725af0c..ee3bcb12ec 100644
--- a/wp-admin/includes/class-custom-image-header.php
+++ b/wp-admin/includes/class-custom-image-header.php
@@ -882,14 +882,16 @@ endif;
 			$this->set_header_image( compact( 'url', 'attachment_id', 'width', 'height' ) );
 
 			/**
-			 * Fires after the header image is set or an error is returned.
+			 * Filters the attachment file path after the custom header or background image is set.
+			 *
+			 * Used for file replication.
 			 *
 			 * @since 2.1.0
 			 *
 			 * @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 ) {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 9fd2298c56..98ce719cc5 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.4-beta4-56928';
+$wp_version = '6.4-beta4-56929';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.