Index: etc/kopano/webapp/config.php
--- etc/kopano/webapp/config.php.orig
+++ etc/kopano/webapp/config.php
@@ -75,7 +75,7 @@
 
 	// Defines the temp path (absolute). Here uploaded attachments will be saved.
 	// The web client doesn't work without this directory.
-	define("TMP_PATH", "/var/lib/kopano-webapp/tmp");
+	define("TMP_PATH", "/tmp");
 
 	// Define the path to the plugin directory (No slash at the end)
 	define("PATH_PLUGIN_DIR", "plugins");
