The example trigger to make an asset live on creation listed in the manual doesn't appear to work when an image is uploaded in-line (i.e. via dragging and dropping, or via the insert image tool instead of via the Asset Creation Wizard)
Any suggestions on the correct trigger conditions?
Edit: Never mind. Immediately after posting I realised I was over-complicating things.
Adding an Asset Created event, and removing the URL matches condition seemed to do it.