Index: src/wp-admin/async-upload.php
===================================================================
--- src/wp-admin/async-upload.php	(revision 59547)
+++ src/wp-admin/async-upload.php	(working copy)
@@ -128,7 +128,7 @@
 		),
 		esc_html( $id->get_error_message() )
 	);
-	wp_admin_notice(
+	echo wp_get_admin_notice(
 		$message,
 		array(
 			'additional_classes' => array( 'error-div', 'error' ),