When I bring a video file into my project, I often get a message that says "an expansion package is needed in order to use this audio feature" - what is this? Seems to happen when I load an .MOV file, but if I hit IGNORE it seems to load okay, and the audio on the file is there. It's a free download, but I'd like to know what it is, and if I really need it. Never seen this before.
Thanks in advance.
Harry D.