If you have permission to update an asset then you will see an 'Edit' button on the Asset details page. You can access this page by searching for the asset and then clicking 'View details' in the search results.

On the Update asset page you can change the metadata of the assets, upload a different file for the asset (e.g. replace a document with a new version), and change the categories and access levels that the asset resides in.

If Advanced Viewing is enabled then you can optionally mark the asset as being available for advanced viewing by groups of users that have also been marked as advanced viewing. Advanced viewing enables groups of users to see unnapproved assets (only if the assets would be visible to the user if approved).

When looking at the edit page if batch releases are enabled then the user is forced to select a batch release for the asset, this will either be a new release if the asset is a new upload or if the asset is an existing one being edited then the choice will either be to leave the asset in the release it is currently in or select a release that the asset should be moved to. 

Click ‘Save' and your changes will be saved.