Hello people, has anyone implemented ajax file upload in an Errai app. I need users to be able to upload simple passport photograps, certainly the form will be a multi-part form, but will the submission be via RPC Caller proxies too? And will the server class be different from other Errai based server classes (e.g if using commons-fileupload which has a class that the file-handling servlet must extend). Is there any code sample I can look at. Thanks.