I'd like to upload files through a custom File Upload servlet that runs from the same
Tomcat server but is not part of XWiki. This servlet does some file processing and stores
the file in a separate area away from the XWiki attachments, and it's possible that
eventually this servlet might be moved to another server as processing demands change.
Is it possible to make use of the supplied XWiki UI widgets to upload to this servlet? Any
guidance on how to do this would be greatly appreciated.