Have you split a single video into multiple segments? If so then that function allows you to re-combine them. It isn't meant to and doesn't combine multiple clips that were imported separately. That is done when you render the timeline and you produce a single file.
p.s. - I can only think of 1 benefit to using this function rather than the keystroke CTRL+Z (undo) and that is the fact that you can use it long after you have split a clip whereas undo simpy refers to your last action and therefore would only be useful if you immediately change your mind.
This message was edited 1 time. Last update was at Mar 10. 2017 06:14