diff --git a/includes/admin/class-admin.php b/includes/admin/class-admin.php
index b6c7bbaf..e9b5ed80 100644
--- a/includes/admin/class-admin.php
+++ b/includes/admin/class-admin.php
@@ -745,7 +745,7 @@ if ( ! class_exists( 'um\admin\Admin' ) ) {
 						'sanitize' => 'text',
 					),
 					'_max_size'                       => array(
-						'sanitize' => 'absint',
+						'sanitize' => 'empty_absint',
 					),
 					'_height'                         => array(
 						'sanitize' => 'text',
diff --git a/readme.txt b/readme.txt
index ae66a2a9..312d97e6 100644
--- a/readme.txt
+++ b/readme.txt
@@ -170,6 +170,7 @@ No, you do not need to use our plugin’s login or registration pages and can us
   - Fixed: Email notifications sending
   - Fixed: File and Image uploaders and allowed types data for them
   - Fixed: Content field-type editor in wp-admin Form Builder
+  - Fixed: Image and File uploaders max size saving in wp-admin Form Builder
 
 = 2.6.1: May 29, 2023 =