Issue #3355247: Image uploading failure

src/Plugin/Layout/AwesomeLayout.php

@@ -171,7 +171,7 @@ class AwesomeLayout extends LayoutDefault implements PluginFormInterface {
       '#default_value' => $this->configuration['section_properties']['background_image'],
       '#upload_validators' => [
         'file_validate_extensions' => ['gif png jpg jpeg svg'],
-        'file_validate_size' => '30M',
+        'file_validate_size' => [1024 * 1024 * 30],
       ],
     ];
 
@@ -237,7 +237,7 @@ class AwesomeLayout extends LayoutDefault implements PluginFormInterface {
         '#default_value' => $this->configuration[$key]['background_image'],
         '#upload_validators' => [
           'file_validate_extensions' => ['gif png jpg jpeg svg'],
-          'file_validate_size' => '30M',
+          'file_validate_size' => [1024 * 1024 * 30],
         ],
       ];