TAB_FILES_EDIT widget: Validating files

Hello,

For one of my types I need to validate uploaded files compliance against a web service. This works pretty well with the main content action widget, and now I want to trigger my validation code from the TAB_FILES_EDIT widget.

I was planning to use the fileUploadListener attribute for it but It does not seem to works. While I get exception thrown based on the validation response as expected It leads to strange UI behaviours and unwelcome seam transaction errors in the logs.

I don't get how the widget works. Is there any resource or source code to help me with this ? How does the files ends up being stored in VCS ?

Sorry if I missed it but search engines didn't show a great help on this topic.

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