Uploaded File Versioning
How to handle an uploaded file versioning (specifically updating file version) programmatically ?
See https://jira.nuxeo.com/browse/NXROADMAP-263 for details regarding Nuxeo's plans to address this and other versioning-related issues. Until then, you can customize the Bulk Import form/action to achieve the desired result. For example, you might want to add the standard versioning widget to the form and customize the back-end FileManager plugins to honor the state of the widget.