Ticket #44864: 44864.diff

src/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php

@@ -805 +805 @@
                         return new WP_Error( 'rest_upload_file_too_big', sprintf( __( 'This file is too big. Files must be less than %s KB in size.' ), get_site_option( 'fileupload_maxk', 1500 ) ), array( 'status' => 400 ) );
                 }
 
+                // Include admin function to get access to upload_is_user_over_quota().
+                require_once ABSPATH . 'wp-admin/includes/ms.php';
+
                 if ( upload_is_user_over_quota( false ) ) {
                         return new WP_Error( 'rest_upload_user_quota_exceeded', __( 'You have used your space quota. Please delete files before uploading.' ), array( 'status' => 400 ) );
                 }