Hi,
the glue tool should work as you have described. Select the events that you want to Copy and then press on Glue. You cannot glue Audio-Events at the moment.
Could you be a little more specific about the situation in which the glue tool does not work as you expect? A screenshot, for instance, would be a help to sort out whether the tool works as intended or whether you are experiencing a bug.
Kind regards,
Frieder