I have edited an movie in iMovie complete with clips, music, photos, etc. However, playback is acting very sluggish from my External HD. Therefore, I want to attempt to move the file to my main HD. Can I simply move the project file to the HD and have the edited version with all the media, edits and transitions accompany it? If so, is it simply a matter of copying the project file from the External HD to the main HD? Thanks.