Index: core/admin_templates/js/uploader/uploader.js
===================================================================
--- core/admin_templates/js/uploader/uploader.js
+++ core/admin_templates/js/uploader/uploader.js
@@ -616,8 +616,9 @@
 		return ;
 	}
 
-	// new uploaded file name returned by OnUploadFile event
+	// new uploaded file name/size returned by OnUploadFile event
 	file.name = $json_response.result;
+	file.size = $json_response.size;
 
 	this.onUploadFileComplete(file);
 };
Index: core/kernel/db/db_event_handler.php
===================================================================
--- core/kernel/db/db_event_handler.php
+++ core/kernel/db/db_event_handler.php
@@ -3151,12 +3151,13 @@
 			$upload_helper = $this->Application->recallObject('kUploadHelper');
 
 			try {
-				$filename = $upload_helper->handle($event);
+				list($filename, $size) = $upload_helper->handle($event);
 
 				$response = array(
 					'jsonrpc' => '2.0',
 					'status' => 'success',
 					'result' => $filename,
+					'size' => $size,
 				);
 			}
 			catch ( kUploaderException $e ) {
Index: core/units/helpers/upload_helper.php
===================================================================
--- core/units/helpers/upload_helper.php
+++ core/units/helpers/upload_helper.php
@@ -40,7 +40,7 @@
 	 *
 	 * @param kEvent $event Event.
 	 *
-	 * @return string
+	 * @return array
 	 * @throws kUploaderException When upload could not be handled properly.
 	 */
 	public function handle(kEvent $event)
@@ -105,7 +105,11 @@
 			$this->deleteTempFiles($thumbs_path);
 		}
 
-		return preg_replace('/^' . preg_quote($id, '/') . '_/', '', $filename);
+		// Add display name/size of uploaded file.
+		return array(
+			preg_replace('/^' . preg_quote($id, '/') . '_/', '', $filename),
+			filesize($file_path),
+		);
 	}
 
 	/**