Why can't I mix paste properly and easily, close to the end of a file?



If I'm mix pasting a segment from one file that is say, 2 minutes long, into nearly the end of another file, placing the beginning of the file to be pasted at say, 30 seconds prior to the end of the file I'm pasting into, the new version of Audition does not automatically make enough room for the entire file, and cuts off the mix paste. Do I have to first manually add the amount of time I need? That is not something I had to do with my older 2.0 version. Or am I missing something here, a setting in preferences or something, to change that?