# Limitations

> Known constraints in UiPath Apps, including unsupported characters, expression restrictions, and process chaining limitations.

* You cannot configure **Custom List** controls with VB expressions.
* You cannot chain processes via input override. For example, binding the object output of process A to the input override of process B.
* Apps built during the VB preview and published before May 25th may need to be republished and deployed in Orchestrator folders.