I transferred a song to my laptop by 'save as', went to a location and recorded percussion with it. Back home, I dragged the original Logic X project file out of its Project folder and put the project file from the laptop in there. I also dragged the newly recorded audio files into the original audio folder. Now, when I open the new Project file, I get a long list of audio files that can’t be located. They are called something like "audio 1#01_1.aif". I thought I had I saved the project to the laptop from inside Logic X via firewire/thunderbolt. I don't remember, but it is possible I wasn't sure the audio files had been transferred so I dragged them in again because I have 2 of everything on the laptop with the duplicates named with an underscore and 1 at the end. The audio file titles are otherwise the same as the originals. I cannot locate any of these on my desktop computer system. Right now, on my desktop using the new project file, only the newly recorded audio tracks from the location recording and midi tracks play, even though the original audio files are in the Audio folder. If I open the original file, it opens and plays normally (but without the new tracks, of course). How can I add the new files to the original? Is there a way to get all the new tracks created and the regions placed exactly where they were recorded? I would prefer to use the newer project file recorded on the laptop, as it was virtually the same as the original except for the addition of newly recorded tracks. How should I have done this? What are the best practices to go to a location, record and then transfer the newly recorded tracks back to the original desktop computer? If I had time, I would have made stems. I have done that in the past. However, I feel obligated to bounce tracks starting from the beginning so that they can all be imported and placed with no problems. This is often a tremendous waste of HD space though.