Hello, there is a way upload files with ajax using your "nxu:inputFile" tag inside a form like this:
<h:form>
<a4j:include viewId="/wizard/wstep1.xhtml" />
</h:form>
In "wstep1.xhtml" I show my nuxeo document and it has metadata "file:content" but when I select a file, it is erased and it not is upload