diff --git a/extension.json b/extension.json
index 4c5dce0..1432d20 100644
--- a/extension.json
+++ b/extension.json
@@ -18,7 +18,8 @@
         "MimeMagicInit": "MediaWiki\\Extension\\GlModelViewer\\GlModelHooks::onMimeMagicInit",
         "MimeMagicImproveFromExtension": "MediaWiki\\Extension\\GlModelViewer\\GlModelHooks::onMimeMagicImproveFromExtension",
         "BeforePageDisplay": "MediaWiki\\Extension\\GlModelViewer\\GlModelHooks::onBeforePageDisplay",
-        "AlternateEditPreview": "MediaWiki\\Extension\\GlModelViewer\\GlModelHooks::onAlternateEditPreview"
+        "AlternateEditPreview": "MediaWiki\\Extension\\GlModelViewer\\GlModelHooks::onAlternateEditPreview",
+        "UploadForm:BeforeProcessing": "MediaWiki\\Extension\\GlModelViewer\\GlModelHooks::onUploadFormBeforeProcessing"
     },
 	"ExtensionMessagesFiles": {
 		"GlModelHandlerMagic": "GlModelHandler.i18n.magic.php"
diff --git a/includes/GlModelHooks.php b/includes/GlModelHooks.php
index c03884b..0e247dc 100644
--- a/includes/GlModelHooks.php
+++ b/includes/GlModelHooks.php
@@ -102,6 +102,30 @@ class GlModelHooks {
         $out->addModules('ext.glmv.upl');
     }
 
+    /**
+     * MWHook: Called just before the upload data, like wpUploadDescription, are processed, so extensions get a chance to manipulate them.
+     * 
+     * @param SpecialUpload $uploadFormObj current SpecialUpload object
+     */
+    public static function onUploadFormBeforeProcessing( $uploadFormObj ) {
+        $uploadFormObj->mComment .= <<<CONF
+        
+        <pre>
+        {
+        "viewerConfig": {
+            "default": {
+            "camera-controls": true
+            }
+        },
+        "annotations": {},
+        "annotationSets": {}
+        }
+        </pre>
+        CONF;
+
+        return true;
+    }
+
     /**
      * Small helper function to display information on the browser console
      *